Is there a demo ?
Yes, there is a demo version of PFS-2 which can be installed to a very small partition (<10MB) to give you a sense for whether you want to buy the commercial product.
The demo is now available in the same revision as the currently shipping version (right now it's 4.2 (17.8)).
I have been asked by Greed to withdraw the demo. Apparently they need permission from the distributors before making a demo available. It also has to be tested. Personally I believe that a demo would be a good advert. On the other hand we have to consider if the extra work is worth it... Remember that PFS-2 is now reasonably priced !