I've been around 2 different ones, seen several others too. Not nearly as reliable as a banshee or 250r. A guy I work with had an 88 and said he traded his banshee for it, both were stock but he claims the banshee wouldn't touch the zilla. Very big and bulky also. Fenders are huge, both front and rear. Has a very deep sound and doesn't whine like the banshee, I guess since it doesn't rev out like the shee. I know 87 was the first year, I think 90 or 91 was the last...I know the earlier ones were powervalved, but I want to say the last year or two weren't or were slower for some reason. I know most people want the 87-88's and I think it's for that reason, but I may be wrong. A guy I know has an 87 sitting in a shop up the road and I thought about buying it and going through it but it doesn't run, the frame is bent near the front bumper and the case it cracked where the rear mount bolt goes through. I know where another sits that is mint but needs a rebuild (doesn't have any compression when you kick it over and the guy wants $3,000). I'd like to have one to mess with anyway, faster or slower than the banshee it's a piece of quad history.