Euphoria:
Bergantino NV610: biggest win ever for me. All the SVT 8x10 magic but in a smaller, lighter box.
Reiner Amplification all-tube preamp
SansAmp RBI (also RBI+RPM run-in-parallel combo)
Ampeg SVP-Pro, mine is made in USA, no noise/hum issues at all
SWR Interstellar Overdrive
Bergantino HT115: never heard a fifteen that sounded so great (though the NV115 is close, in a different way)
Disappointment:
Epifani Ultralight cabs. Got 'em when my back was acting up. Quality construction, loved the light weight... I can see how others would dig the tone, but it didn't work for me.
I could list many more "meh" purchases, but they're for old, obsolete gear