A friend and collegue of mine, did his B20-rating (+ProLine check-out) with Bristol.
He was very happy with everything there.
...and yes, all the training did take place in the actual aircraft. No sim.
He's happy to recommend them to anyone, he says.
When that's all said and done,....jobs are scarce at the moment. Even for those of us who has plenty of time on type. (Not that I'm looking for anything at present. Enjoying myself way too much, where I am at moment!)