I always have something positive to say about the Grosvenor and have responded here several times. I've stayed there twice (my second trip just last month). My son (15) thinks we should stay there every time we go. I always opt for the wing rooms since they are so much cheaper. My first stay was via priceline and this last stay with an entertainment rate.
We like the pool, the refrigerator, much quieter than All Stars (and cheaper), great transportation to parks, compact (not a lot of walking to get to buses), right next to Downtown Disney, great restaurant (even has character meal at breakfast) and lobby bar, participates in early entry, issues UPH (& allows you to drop 1st or last day), and friendly staff.
I also think you can get great deals with Priceline and recommend it highly but you aren't always sure to get a downtown disney resort. I like being sure of getting the same perks as staying on site.
Carolyn