Price, pin valve can come out if not done right first the time.
I didnt really want to buy this tank at first because i didnt i swore by crossfire, theyve been around forever and i liked the way my old 45 performed. i bought the tank as a new bottle at my local shop, which it was but the sci tank is dated a little older than i would have like, i was hoping it would be an 05. i picked it up for 200 bucks. the thing looks flawless outside, the resin is nicely polished, and there is no fiberglass or carbon fiber thread texture, all smooth as glass. the reg is nice and small, anodized nicely. the fill nipple is stainless (really nice). the one thing i dont like is the hard to read little gauge. and the fact that the burst disc is an internal setup. the externals make it so you can use the conventional nipple covers, so i just had to buy a cp one. no biggy. great buy tho.
If you can get it for 200 bucks, dont pass it up. it performs nicely, but the reg can be outrun by a fast gun. the design and size are great. buy it.