PowerDVD Ultra is the "best" of the bunch. It's not as bad as what a lot of people would make you think, but at the same time it needs work. I don't know about XP, but in Vista Media Center you can configure it to where PowerDVD Ultra starts from within Media Center when you put a Blu-Ray in, and after you exit the program, it loads Media Center again.
I have the Media Center USB receiver as well, and I can use my remote within PowerDVD. It's not perfect software by any means, but I can't imagine many people thinking any of the other choices are better.
I have the Media Center USB receiver as well, and I can use my remote within PowerDVD. It's not perfect software by any means, but I can't imagine many people thinking any of the other choices are better.