I have three and they're like Hamfist said - clean, loud, built like brick shitehouses.
The good news is that you can do some simple mods that really open them up. If you can get one for under £200 I'd say go for it. Spend another £100-150 on a service/mods by a tech who knows vintage amps and you'll have a great amp.
In stock form, you'll not get it overdriving until the master is on 7 and the channel volumes are flat out. Even then, it's bluesy overdrive. Like I said before though, you can get them sounding great very easily AND the basic circuit isn't too far away from a Trainwreck - bargain ahoy!!!
The output stage runs ultra-linear which increases the clean headroom and also gives a tone somewhere between triode and pentode. The good news is that since the whole amp is point-to-point wired, changing the output stage to run in standard pentode mode isn't a big job.
