When I first got my second hand bike with 729's on it, it had about half a dozen dint's identical to the ones Musashi posted, I **** myself. I was heading off to the National Champs the next week and was dreading building having to build up a new wheel half way through the event. I lost count of how many runs it did that week, on a pretty dam rough track, lowish pressures, and I also tend to be abit of a plow

But those dents didn't move one bit in the whole week, and thats when I was sold on the 729/721 rims.
Today I've owned a set of 729's and 2 sets of 721's. The First 721's were laced to hadley's, and after a whole season I had a minor dint in he front. Now I've got another set of 721's laced to Pro 2's (Incredible sound

) for my hardtail and there going strong aswell.
The Point of this overly long post - 721's then 729's or 823's if you want Tubless :thumbsup:
Happy Trails.