I've fished these a few times and they work. I've caught catfish, crappie and panfish so far. I think larger ones will work for stripers and bass. I hope to find out shortly.
Carp Aficianado recently had a post about fishing for carp using midges. I took a shot at tying the flies he described. I didn't have any red beads so I tied some using the beads I had.
The flies are basically black thread, gold wire and a bead tied on a size 12 hook. Really easy to tie. Looking forward to testing these out soon.
The buff I ordered came in recently. I should have a review of that up shortly.