I've betaed a handful of times, but I don't think I'm very good at it and I don't especially enjoy it, so pretty much I've quit doing so. So as I say I'm always impressed by those who are able and willing and like to.

(Every once in awhile I think about whether or not I should try to find someone to beta for me regularly, but I don't feel like I want/need the assistance often enough to make it worthwhile. So far the few times I've wanted help and put out a plea on my journal, I've been lucky enough to have someone offer.)