Very good in the first couple of months. Tight grip, excelent rolling resistance and very good offorad. Only 1 flat in 7 months.

More traction stubs are needed, the tires slip sometimes, and they wear to easily. Im already looking to Specialized Team Masters and Conti Twister or Traction Pro.

Good performer, in my opinion it needs to look more aggresive. I live in a typical desert area and the tires tends to give out when turning on loose gravel offroad. I ride on these tires almost every day. I probably put 400 miles on these tires. Take my advice, its a good tire just some flaws. Its a good value.

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Maxxiz

Low rolling resistance
Stable cornering
Price
Good on road and hardpack

Narrow
Not good in loose terrain

Good tires for commuting and offroad on either hardpack or solid rock surfaces. I got these from my LBS because they were cheap and offered better thorn resistance than the stock tires that came on my bike. They roll well and corner well on the road but offraod they are too narrow and not aggressive enough to feel really comfortable with them. I keep mine aired to 50 psi or so for road use and can make them work off road on all but the really loose gravel and such but it does take a bit of working with them to do so. I will probably get something more aggressive but these tires work as expected and make good commuting tires and general-use tires. I will have to wait to see how the advertised toughness works out.

nice vried terrain traction,resists flats pretty good(so far),really grabs the ground an dose not skid when braking.

could be just a little wider and the tread could be more
aggressive on the sides(if they put a more aggressive tread
in the middle, the road would wear it down.)

some ok all around tires.could use a little workin the off-
road dept but still, I mostly ride in the street anyway.
one thing they could do is widen up the tires to about 2 in. or make the treads a tad more aggressive. get them if you are a weekend warrior,whorides alot on the road during
the week or commutes,and hits the trails on saturday.(or if you are like me, a kid who can't always make it to the trail, and just rides off every curb, dirtpile and pothole
you can find instead. and to make things even better, school
just got out. so you ride mostly all day in the best places
you can find.ex huge hill with nasty slope and old rock
paving with the pointy edges sticking up.Talk about brain
jarring.) Good value tire also. really good but the price tag is not horrendus. they loose 1 chilli because the off road performance could be improved. Don't buy it if you are
an off road racing guru with a need for serious dirt performance.

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none(first mountain bike)

Round profile, relatively low rolling resistence, flak jacket, price ($15.00 ea).

None so far.

So far these tires inspire a lot more confidence than others I have tried for this purpose. I wanted a relatively full-size smooth rolling knobby that could handle the occasional break through a dirt lot or grassy area but would still do well on pavement and resist flats.

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A gaggle of semislicks for urban riding. While they roll well most have been a disappointment...too many cuts and flats.

Light weight

KNobs rip right off.

After riding less than 10 miles I've lost 4 knobies. In Arizona it's nothing but rocks, gravel, rocks, sand, rocks and rocks. The knobs paid the price and I don't feel comfortable riding them here with big gaping holes in the tire (imagine that). Even the front tire (should last a while, right?) has lost a knob and it threatening to loose some more.
If your terrain is more forgiving, then you should have no problems.
I'm going to bug Specialized and see if they will replace them. If the replacements are better I'll try and remember to post here again.

low rolling resistance, very good on hardpack, price

narrow 1.95 tires, not stable on loose terrain

The round profile and narrow 1.95 tire gives you low rolling resistance on and off road. This is a recreational tire that is a good compromise for those who want to ride off road(hardpack) and for commuting. Although not labled as a dual purpose tire like the Specialized Crossroads EX, it offers a more aggressive tread design than the EX, but has smaller knobs than most cross country tires. I noticed a two gear difference between my Mythos XC tires and the Ground Control 99' tires. I wouldn't use this tire on loose terrain, but for someone who wants more speed without losing the aggressive tread design this is the tire. A great tire for the price, only complaint is the width.

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Mythos XC, Hardrocker

Excellent on hardpack.
Corners noticeably better than the old Ground Controls, whose tall side knobs squirmed.
Reasonable price.

Less cushy than the old Ground Controls.
Narrow width does not inspire confidence in loose rocks or extremely bumpy surfaces.

A good tire overall but I am going to switch to a fatter tire on this bike. A lot of the trails I ride have loose rocks as well as embedded ones, and this tire doesn't feel as secure on them as the old, fatter Ground Controls, which were terrific on such surfaces. Specialized labels them as 1.95 (same as the old model) but they certainly look and feel narrower.I will put these new Ground Controls on another bike that I use mainly on shorter rides/less bumpy surfaces.

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Original Ground Control tires

Inexpensive

A tad hefty

The newest ground control tires are narrower than the old model even though both are advertised as 1.95. The new tires work just fine on hardpack
as well as moderate slop. They are very resonable tires for the price.

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Velociraptors