Love doing Stereo Reels.
I've been doing stereo reels with RetroViewer for about 15 years and always have had a great experience. The staff is friendly and helpful (they've found -- and identified -- a few mistakes I made and let me correct them before creating the reels). I have been creating my own stereo pairs with PhotoShop and GiMP (a rather involved process). I'm seriously considering getting a stereo camera because the images can go straight to stereo reel production without a lot of work. True stereo reels are lots of fun and real people pleasers.