When we changed from Flitestar a couple of years ago, within a week of speaking to Air Support about PPS they hopped over from Denmark in thier Seneca to demo the system and had us up & running (including on-site training) within the month.
The PPS/Crewbriefing system itself is more than adequate for our use, it's user friendly and the guys in support very helpful and receptive. Would have no hesitation in recommending it. We run it both in the office and remotely from laptops.
As you say, the advertising blurb makes it look impressive but we have found it to be everything it claims to be. I have met a number of European users on the PPS Seminars, from GA operator's, regional airlines and military - all of who seem to be very happy.
Feel free to PM me if you need any more info