I do agree on all things stated here. My personal experience is that PPS does the job ok. When planning trips around Europe and Eastern Europa it comes out with a valid flightplan in most cases. I would estimate that 90% of the plans generated are ok. The CrewBreifing.com is also a big help in the distribution.
Last but not least you can buy PPS for much less than LIDO OCC. What are your experiences with PPS ?