They're typical modern Marshall I think. Three channels of OK-ness, but they won't blow you away?
I think people would like them more if they made better cabs and didn't put g12t75s in them
The TSLs very much a jack of all trades, master of none amp. They sound ok, but marshal tried to make it all things to all men. Oops. Not an amp I'd recommend for anyone outright - very much one that you might like if you tried it.
Let's say like this: Whenever I speak to people who own a TSL, they tell me stories about what all they changed to get it right, tubes, speakers, mods, settings, pedals, ... until they realise that it's just not right and get a JVM...
i dunno, but if he does it might explain why he still has that haircut... o_O