We went to Flash streaming just over a year ago. We offer it in 3 sizes. Members love it!
However we did start to offer a limited download area asthis past Summer. Where members can download a full length Wolff DVD. We keep 6 in there at any given time. We remove the DVD from 6 month ago when we add a new one every month. Found that this boosted our retention rate and offered a nice value added benefit to our members. The majority of our members never download anything, they just stream content. I think people want there content quickly and easily and that`s what flash does.
We also get very few complaints about videos not playing with flash.