As mov for the only format in members area then NO.
I love qt and h264. Can make some really nice looking movies. I would use it on sites with hd. But along with wmv and flash too.
avi/xvid great too and can be a cool option if you want to offer movies that can be played on tv`s without having to work with the file after download.
The safe choise for members would be wmv, flash, mpg and any avi type.
I`m going with wmv and flash in my members area.
