I've had a set of these speakers from new, I think they cost me about £800 - £900 if I remember rightly and I paid a little bit extra for the birds eye maple finish.
There were not many reviews around at the time so you might not find much on the net about them.
I auditioned them at audio-t alongside a set of dynaudio audience 50 and also something from B&W (can't remember the model now) and I was immediately struck with how natural and open they sounded, they were my clear favourite.
I have always been really impressed with them. The dynamics, detail and soundstage are all excellent and as far as I am concerned they sound as good today as they did from new. They give real long term enjoyment and I have no intention of selling mine.
As for selling them on and what you should pay second hand it's hard to say as they don't often come up on the auction sites which could either mean that people do not get rid of them or that not many were made in the first place (my serial number is in the 1000's). I can't comment on how they sound compared to the PMC TB2+ as that is not a speaker that I have heard. I run my pro acs on the end of a roksan caspian integrated / power set up.
I'd check the condition of the cabinets when buying as they were really nicely made speakers and it would be a shame if the finish had been damaged over the years.
Hope that helps a little.