Definitely my Fender "Evil Twin" that I bought around 1999/2000.
I bought it after doing summer jobs and my dad helped a bit. Unbelievably expensive for me at that time, but I had a strong urge and didn't get that it was an overkill amp for me as a teenager. Couldn't even carry it like a man, but really wanted to have it...
A classmate worked at the store, so I got employee's discount (20% off).
A few years in, it started acting up. Intermittent crackle and pop, fizzle, whine, all the perks it's notorious for.
It stood still, collecting dust, sadly, for a long time, until I got it fixed up by a local tech a couple years ago. I'm glad I did, because it sounds awesome and older me appreciates the big iron. Works great on its own, but also as a power amp for Helix or preamp pedals.
I remember reading the infamous "distortion" channel is somewhat Mesa-inspired, not sure about that though. The cleans are absolutely stellar, that's for sure.
Good thing I held into this.