i have one that i used to ride a few hours every day. i'm 6' 140 lbs and never had a complaint about the size. i liked the smaller size, it was a lot easier to throw around than bigger quads. i also had a honda 400ex for a while, and i really did like the blaster much more. it wasn't as fast but the power band felt stronger, i think its just 2 vs. 4 stroke.
if i were getting another i'd look at an older honda or suzuki 250, there cheaper run better, just allaround better than a blaster is.
it really depends on what you want to do though. with enough pratice a blaster will do pretty much anything you want it to do. i didn't have any problem climbing very steap or rocky hills, its GOOD at every thing, but not great at anything.
and a pipe and set of reeds ($250 total) will have it screaming. the only real weakness they have is their suspension. i don't know if that has been fixed yet or now (mine is a 98)
they do cost more, but look at the polaris 2 stokes. scrambler 400, xplorer 250 older 300, and 400 and the trail blazer. if i could get another it would be the scrambler 400 4x4.