I've had several V-22s, A 1960, a 1990, a V-55 head, a 333XL and still have a 1960 infinium.
They ALL sounded excellent. The 333XL was one of the early ones that had the "flameout".
It was actually due to the molex connector that was used. Due to the higher heater current of EL-34's over 6L6's
and using the same gauge connecter it would burn through disabling the heater on the power tubes.
I just soldered the wires from that connecter directly to the pins on the PCB and the amp was bullet proof after that.
The flameout thing was way overblown. I'm not aware of this happening on any of the lower wattage (V-22) amps.
The V-55's were 6L6 based so I doubt it happened on any of those either.
As for tone they ALL sound great and there's an amp for all tastes in their line up.
That said I almost NEVER use my last remaining Bugera amp. Not that it's not great sounding I just moved on from it.