Lightweight, Extremely strong, Very comfortable.

None that I have experienced.

I bought this seat after bending several rail system seats. It didn't matter who they were made by or how strong they were supposed to be, I bent them. I am 6'9" and almost 300lb, and ride intermediate downhill/freeride. This is the ONLY seat that has held up for me. I bought it over 3 years ago and it has held up like a champ. It was a little sticky at first, but once broke in I really like the feel of the seat. I highly recommend this seat to anyone that bends seat rails.

Similar Products Used:

Stock seat, WTB, Azonic

Light weight, looks and ease of use. No issues with seat coming loose, ever. Use it properly and it works perfectly. I have the SDG Bel Air SL seat whih is extremely comfortable and durable. Still 100% after 4,5 years.

None at all.

This is teh best seat and post combo I have ever used. Its very light, not bthat expensive and looks great. the seat is extremely comfortable on long rides too. If I break it or wear it out, teh same post and seat are going back on...

Similar Products Used:

WTB and other std railed saddles

looks good

does not work, the seat keeps tilting back, even after tightening the bolt as hard as possible. after 5 times on re- tightening the bolt has now worn out and cant be tightened fully. hence the issue is now much worse

if you like looking at your bike but dont ride it then buy the Ibean.

Light, easy to adjust
Better than kore I have broke 2 of their posts to date!

Limited choice, harsh ride.

This is definiatly a love it or hate it product, it is light & cheap, & with loads of adjustment (dont understand these people saying it has limited adjustment)
Also I cant see how people are having slipping trouble as a medium torque leaves this super sturdy!
I have an sdg saddle, but started off using kore posts, my carbon one snapped within 6months & an ally one followed shortly after! The sdg post seems much more rigid.
No-one seems to have mentioned the harshness of the ride with these set ups, on my hard tail I really start to suffer on long day rides as there are no rails to add a bit of give.
I would suggest that on a full suss this product would b near to perfect!

Similar Products Used:

Various carbon & top end standard systems

Immoveable, single bolt design. Study and light.

No layback available as yet.

I've used this almost since it came out and never had a problem with it. It sits there, doesn't move and feels good with like minded saddles. Having got a new bike which requires a degree of layback, I may have to switch unless SDG come up with something.

Similar Products Used:

Lots of different 'rails' saddles.

Light?

Weak bolt. Proprietary rail system.

The I-Beam seatpost was part of a a complete Dahon Flo that I purchased. While setting up the bike I wanted to shift the saddle forward. The seatbolt was a loose fitting 5mm (I tried 5.5mm but that was too big) and the bolt burred and became useless in the process of trying to loosen it. So I stuck with the seat in its original position - thinking that the bolt must be tight. But I was wrong, the saddle slipped further back wrecking the little grooves on the rails. So both saddles and seatpost wrecked. I'm not a heavy rider so I wouldn't recommend this product to anyone.

Similar Products Used:

Thomson Elite, Ritchey something, various unbranded

Light would be the only thing that springs to mind.

Limited Saddle selection. Because of the I-beam. No place on the saddle to put a saddlebag. This is a personal thing as I do a lot of weekday rides of around 60 minutes and don't always want to carry a backpack with me.

I find it easier to "fine tune" saddle levels with two bolts as opposed to one on the side.

When I first saw the i-beam couldn't work out what the fuss was about. It does work, just limits your choice of perch.

I was convinced to give it a try when I bought my new bike mainly because of the weight advantage. Setup was nothing spectacular no quicker than the specialized with a conventional saddle.

Because you don't have much saddle choice the system limits you. It was also supplied with a shim as the post is too small for my seat tube. Net result, it constantly slides down. Fault of the LBS I know, but just adds to the irritation.

And that coupled with the saddle rubbing me raw leaves me massively irritated !! Something that has never happened to me before on any other saddle that I have used.

Because it is all proprietary components I will now have to replace everything. You either like that or don't; I don't.

Back to Thomson and WTB for me.

Similar Products Used:

Single release specialized seat post on Stumpy and Enduro that I demoed would be the closest.

Easy to adjust, saddle and post setup alot lighter than standard post and saddle with rails, cheap

None

Excellent post, paid £40 from wiggle for the post and saddle. I shaved a couple hundred grams off my old setup. Adjust it once and it doesn't move or need touching again. Perfect.

Similar Products Used:

Standard post

holds seat nice and tight

impossible to adjust, grips the seat too tight. only takes sdg seats

Hard to adjust seat, also hard to keep post from sliding

Solid and easy to adjust. Doesn't move and the SDG seat it's a comfortable ride. No more seat rails to bend

Post started to bend after 3 months (27.2) but then again I am a 270lb fat dude. I have yet to find one that can hold my weight. I am sure if my frame could take a 30 mm or higher I would be fine.

After reading a few reviews of other people having problems with the seat sliding off, I would defiantly have to disagree. I am 270lbs and I have been way back on the seat and it has budges. I can honestly say I thought I would have broken this post by now but after 3 months of use I am just starting to see a little bit of bend where it goes into the frame (I would have this on any other post due to my size). I have not had to re-tighten or adjust the seat at all since I started using it over 3 months ago. Since there are no seat rails to bend, I can reuse the seat and replace just the post if I bend it. I have bent many seat rails and past as you can imagine with someone my size. So far this is the strongest I have used and I will keep on using!