They’re good solid amps. I’ve modded a few, mostly old P2P YBA heads, into Marshall-like amps (The YBA series circuit is very similar to old Fender Bassman amps and changing a couple of cap and resistor values revoices them very effectively).
The newer channel-switching ones with one or two speakers work well - a friend has one in which he’s swapped the stock speakers with a Legend and a CR, and it’s versatile from low to very high volume.
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