With both the Gain and Level knobs all the way up and the TMB knobs around 5, this thing sounded like Satan raping fifteen cats. I am extremely glad I bought JJ/Tesla tubes to replace the stock Sovteks. Recommended. I'm playing a strat copy with a Seymour Duncan lipstick tube in the neck, DiMarzio Area '58 middle, DiMarzio ProTrack bridge. Gain and Level both at 2 sounds wonderful with the new tubes, and Gain at 1 and Level at maybe 9 is also great.
This is an amp for church gigs, or country/alt-country/rock gigs. In smaller rooms it could probably be unmiked, but I couldn't endorse that in medium to bigger rooms.
It's got a standby switch, so hopefully that will contribute to the longevity of the thing. But, let's be real: this is a $400, Chinese-made, particle board wired amp. Who cares how long it's going to last? By the time it's broken down, I'll probably be able to buy an Indonesian 5 channel Class ABC monstrosity for 230 Euros or whatever world-wide currency we're all using at that point. Just enjoy it while it lasts, people.
Guitar into amp, I really like this amp with the tube swap. If it were stolen, I'd probably get it again, along with another set of tubes, and a neato replacement speaker. Overall, this is a good buy and yet another example of what a fantastic era of gear we live in.