The LV site is great. I do think that most designers should have their own official online shops as I think it might cut down on a section of illegal copies. I think most copies are people doing web searches maybe and maybe feeling intimidated by actually going into the stores. Plus we're all even a tiny bit lazy lol.
Miu Miu's site is note good at all. I mean it is OK and looks nice, but there isn't much content or rather nothing I'd really want to spend a while looking at. I like the sites to be a bit more interactive.