We used to use Flygp for all our perf but they were pretty expensive so now do most perf in house with obs data from the AIP, SITA, Jepps OpsData etc. Noticed that Flygp seemed to have a policy of putting in virtual obstacles (what are they!?!) for some rwy departures and also when we compared actual obs from our own a/d surveys with flygp obs, they sometimes didn't match up.
Flygp also used to do a notam / rwy watch service (which we still have and pay for), but for the last few months we've not recieved any rwy notam updates at all - instead I have to read all our destinations notams daily to keep on the ball... nice!