I haven't yet Kevin, but it's actually the next thing on my to-get list. Like you said it only reduces and doesn't correct, so I'd imagine the edges will be pretty average on the dslr. I'm sure it'll be fine if you had a smaller chipped ccd? I'll probably just get it anyway and if I need to crop, then so be it. No biggie, and it beats spending a truckload on some of these wiz bang reducer/correctors
Cheers