I have used both PMB and PMK for thirteen years. I love it!!
A friend of mine is currently considering the purchase and she has decided to start off by buying one of their ePatterns and see what sort of fit she gets. This includes the free Pattern Viewer download that you will need to work with the pattern.
You can also download the Free Trial from their website and have a play. The only thing you can't do using the free trial is to print out a pattern. So for that reason alone, I suggest you also purchase an ePattern. This enables you to type in your measurements, get assistance for taking measurements and fitting by email and printing out your pattern.
You can also participate in their user forum - there is lots of historical information there although not many people actively asking questions these days.
NAYY but I had a snoop around on their website last night to be able to engage in discussion with my friend.