Originally Posted by
Alan Edwards
Some are vary well made frames, 1500, 2000, and 2500 are top of the line. 1500 are early top of the line and 2000 and 2500 are latter. 600 is still a good CroMo frame with double butted tubes, all you need to do is change what you don't like. Do you have 700 or 27 wheels. 700c frames make life easier to update.
I have a Shogun 2000 and a Shogun 300. There's a world of difference in the craftsmanship, but even the lowly model 300 is a decent enough bike with comfy geometry. Post some photos of the bike; there are plenty of Shogunistas here who can give advice about the model 600.