Ok, i got these pants a little while ago, and so far i've used them in some backyard games, and used them at the Coram 2003 Big Game, playing in rought woods and speedball.
Durability - After about 9 hours of constants play at the big game, running through briars, sliding into bunkers at the speedball game, these pants were performing admirably. They showed no signs of wear and tear, and their rugged construction was very nice, especially with the built in kneepads.
Padding - The padding was great on these. Thoughtout the day, probably 1/5 of all shots to hit my legs actually broke thanks to their contruction. If i got stitched up the side by a string of paint, the shots hitting the pants would generally bounce while torso shots would break. Even in the shower, i noticed i had only one red mark, not even a welt, on my legs, even after a close shooting incident (a dead mans walk with me and 3 teammates vs. 20 red at about 5 feet).
Weight - Not really heavy at all. I've heard in the 2003 pants some people complained saying they were too heavy, and if you compare them to normal pants, they are a lot heavier. However, some of those claims were a little extravagant and i found this weight did nothing to slow me down, especially not for the benefits of wearing them.
Usefulness - Really, there just nice. The pockets dont let things fall out, the pants have a zipper in the back to keep you cool, and the squeegee holder holds a squeegee without letting it slip out. My 14" push squeegee didn't fall out the entire day. They also stayed comfortably the entire day. It was muggy and hot, but i didn't really notice the pants too much despite this, and in cooler conditions they stayed warm.
Availability/Price - You can find them pretty much anywhere, and there by a respectably company. Thats a plus in my book/
There $70 online (i got mine for $50), which is easily comparable to a lot more of some of the other prices companies have.
Another great product by JT, definately worth looking into if you want a pair of paintball pants.