I have a 2001 TXT 321. I love the thing, use it more for trail riding than pure trials. I must say that I have not ridden other trials bikes - but understand that this era has a smoother power delivery than the next generation, which builds power more quickly for the newer trials techniques.
Couldn't suit me better, I love the gobs of torque and while a bit heavier, is also beefier as mntman said.
I'm with cbutler on the zip ties, right off I cracked the "seat," better to make the rear fender able to break-away.
Here is a link with lots of good info. if you choose to go with it.
http://www.gasgas.com/tech.htm
I'd listen closely to anything John Snoodley says (Trials Central,) he knows these bikes and his recommendations for set-up (reeds, suspension) have worked great for me!
Jeff