I spend 7 great days with the 55. This is to be expected, but I was really impressed with the 55 - A LOT, and this is not easy for me to be this impressed. Maybe I have something set wrong, but I don't think so. For you guys that have the 75, take a look at the 55 if you can. See if you don't see what I'm talking about.
Small size means it gets dropped a lot.
Menus and onscreen displays are non-intuitive. Excelent DVD player. Portability is a bonus. Picture quality is excellent. The build quality is great.