While I never bought this one unit I had brand new, it was said to have a 2 to 3 month break in period to which the sound would go from good to bad and everywhere in between during that time. Many folks who owned these all agreed that this is exactly what happened. What I had was Kluass' Odyssey Stratos amplifier. When I bought it, part of the decision to buy used was so that I didn't have to deal with this kind of break in period.
When I get it and hooked if up into the rig, it didn't sound quite like the one I heard in a similarly built rig a buddy of mine had at the time. It was his rig I first heard these in and I was impressed enough at the time to try one out in my rig....but something was amiss. I figured it just had to warm up and I was also aware that it needed two or three days to get straight after unplugging the unit, so I just left it on and went to bed. When I got home from work the next day, the sound had gotten considerably worse! The imaging was severely smeared, the bass was sloppy and slow, the mids just flat out sounded horrendous and the top end reminded me of a distorted BOSE cube. Good thing I had something to do that night 'cause I really wanted to sit down and listen to music.
I wake up the next morning and after doing the breakfast thing, I plop a CD in and try it again. On day three, it sounded fantastic. Everything just came into fruition and it sounded wonderful to me [at that point along my audio journey]. Since I didn't want to go through this again, I made damned sure the amp stayed on 24/7. It was actually designed that way. Well, I just so happen to live in an area of sometimes frequent and violent lightning storms and I was NOT comfortable leaving the rig on when there was a severe threat of lightning.
So, every time lightning was a threat, I unplugged it. As much as I appreciated the attributes of the amplifier, in the middle of one of the worst summer storm seasons, I let it go. I'm so very grateful I never purchased this unit new and because of the reasons aforementioned, I will never own any Odyssey amplifier again.