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 !