I have owned PMC TB2s, FB1s, FB1+ conversions and currently use the AB1s. They are not for everyone. Take note of what your local shop is using up front, PMCs will deliver exactly what you feed them. And see if you can listen to them with tubes as well, its worth it. I agree with Steuspeed, re sale can be a challenge depending on the model, I've tried to sell my AB1s three times 'for a song' and due to lack of knowledge they simply haven't moved...
Go have a listen : )
Go have a listen : )