Re: Rack Mounts
I had an SGX2000 for a few years back in high school (in the 1990's, when it was brand new). I do remember liking it a lot, except that it got a bit noisy when the gain was up high and the compressor was on. I did play with a lot of gain and compression back then though, perhaps I would use less now. But the noise was one of the things I remember not caring for too much. I never liked noise gates, but maybe a good noise gate today would help. Otherwise it did some pretty awesome things for the money. I had considered getting another one off of eBay recently. I replaced it with an ADA MP2 and a cheapo ART minimally programmable rack effects unit (for delay and reverb mostly) and I was never as happy with it. I don't have either anymore.
I remember at that same time, the Rocktron Chameleon (I think that's what it was called) impressed me quite a bit, though I think it was all solid-state. The SGX2000 and the MP2 both had tubes, so I leaned toward those at the time, plus I think the Rocktron may have been more expensive.
My 2 cents.
edit: one of the things I liked best about the SGX2000 were the knobs on the front that I could grab and turn easily. The MP2 was all buttons, to change a setting, push edit, then push buttons to reach the setting you want to tweak, push buttons to go up/down, push button to save. The SGX2000 was really easy to use in that regard. There was even a knob for editing your programmable settings, in addition to the front panel knobs for drive, volume, low, mid, treble, etc....