I had signed up with GPPH also, 15th Nov 2009. here's my review:
1) Suite, pretty decent already and spacious compared to at least 10 other hotels i've seen. many other 5 stars hotels had smaller suites. only thing can't see marina bay. haha.
2) perks, probably the best around, prices are also good value for money for the food too. higher end hotels all minimum 1k+/table for weekend dinners. food also good reviews from friends
3) ballroom, good, big enough, no pillar, high ceiling. very good compared to other hotels ballroom for 25 tables or less. reception area also good. restroom is "private to your guests.
4) Henry is very good and prompt in replies as well. rest assured if things are incharge by him.
5) location is good, convenient, minus the crowd in peninsula plaza. ample parking around the area.
All in all, one of the most competitive and best package for its range!