I think forums are great places to learn what to look for in any potential purchase and be cautioned against any possible pitfalls, however when it comes to discussing/slandering any particular trader you must tread carefully to avoid legal action against yourself and/or Porsche Club GB. I would suggest restraint when discussing any trader and unless you have actually inspected any given car in the flesh to ascertain its true condition/value you should withhold your comments.
I have had the 'pleasure' of inspecting several classics both for concours judging and insurance valuations, all that glitters is not gold in many circumstances, however when said vehicle comes on the market for sale there are many quick to sing its praises and pat the sellers back who have not even seen the car apart from photos on forums, I would hazard this forum is no different at times.
If BM had a car in that interested me would I go and look, probably yes, but it would be a long informed look, as I would do buying any 944 from anyone, trade or PCGB member.
It boils down to the buyer doing his homework, knowing the models weakness's and not being dazzled by salesman's spin.
Cheers, Paul