I've got my trusty 7125 that I've been running since, I believe, a couple years before the 975 released? I bought it ahead of time and ran it with the 1050 for a while so it would be a smooth upgrade when the time came. I can't say exactly when it was, though. I know it was sometime after 2004 and before the 975 debuted. So that's specific.

My impression was that my Outlaw 7500 was 8 or 9 years old. I was curious though and checked my email receipts and found that it's just over 11 years old. It's still running strong. Once I upgraded from the 7125 to the 7500, I've never needed/wanted additional power.

I have an Outlaw 7100 amp I bought from a forum member last October. I guess it's about 14 years old, looks brand new! I bought it to power my 4 overhead speakers for Dolby Atmos, but as it turns out I won't be installing them till late this year. I have it powered up when the rest of my system is on, even though it's not connected to anything. Do you guys think I can depend on this amp; do they usually last longer than 15 or so years? And am I doing the right thing having it powered up but not connected to anything?

You could better get a feel for longevity by giving Outlaw service a call and asking them about work they have done on the 7100. It is basically the same design as their other 5 and seven channel amps and I am sure you can depend on it for the future. You at least have three spare channels.