Anyway, from what I've been reading on the DIS boards and in other reviews people seem to prefer RPC over Sugar Loaf. Can you expound on "completely different feel" and is it worth the extra money?
When it comes down to the two, I do like RPC more, but if it's not in the budget, I would definitely choose Sugar Loaf again. Some of the differences are in location obviously, with RPC being within the main building and Sugar Loaf is a 2-3 minute walk outside. The way the buildings face on property, Sugar Loaf view requests only include marina & courtyard. There are no castle views and only some of the marina rooms will give you a view of the fireworks.
Finally, it's the overall ambiance. We've stayed in Sugar Loaf twice now and I typically describe it as feeling like a bed & breakfast. The lounge and staff are located on the ground level, in what would be the lobby of the building. There are some couches, chairs, tables, food service and CM desks. The only view per se, is what you can see out of the front and rear entrance doors. The lounge doesn't have tv's and sitting there just has a comfy, relaxing feel to it. You pass by the CM's daily and it can be more personal. Now, in the RPC, it's very different. The space is much more spread out, with the lounge on the 4th floor and the CM's on the 3rd. Unless you're room is on the 3rd floor, you may never see the club level CM's other than at check-in. The lounge is arranged on the balcony and overlooks the main lobby. There are large windows that look out over the grounds, a big 3rd floor balcony that is open to guests and a few televisions. In the evenings, there is a piano player in the lobby and when the GF Orchestra starts up, they're located just two balconies below you.
Is it worth all that extra for ambiance? That's the million dollar question.