Ok, to be honest, I've eaten upstairs and downstairs at WP. We hated both times. I will never go back here; when we ate upstairs on our honeymoon (supposed to be our nice night out), we waited 2 hours for our food that tasted horrible. This was the place DH was really lookind forward to, and he was beyond disappointed. Downstairs on another visit (decided to give it a second chance like we do for every ADR if we aren't impressed the first time) was OK; the food was decent, but not worth the price to us. Our waiter was slow there, too.
But, you're going to see good and bad about every restaurant at WDW. Definitely your choice if you want to give it a shot. If you're staying on-property, I believe you get some sort of voucher for a discount and free souvie at PH, though. Or, you can head over to the Budget Board and make a post asking for the PH coupon. There's one that is like $10.00 off your ticket that is good through the end of 2009.