Great review.
Have two 300 SMXs, both taken from combos, so wider than a factory head and with vents at each side.
One is dodgy, sound breaks up now and then so needs attention. But since the other works fine I haven't bothered.
Also have an AH250 Mk V and AH150 Mk V.
But I'm old so go places with a Fender Rumble 500 combo, at 36lbs a doddle to carry.
I'm thinking to get a modern light cab though, then use my Trace/s again.