I have the SP BMC-3s, which have identical specs but a brass casing and optional mini clips. I have been using them for a month now and have been quite pleased. The quality is very good and the price can't be beat. I have used them for stealth recording an outdoor blues show, as well as for open recording of our basement jam sessions, solo piano, solo female vocal, and various ambient sounds. In all cases, any flaws in the recording were from crowd noise, movement, my kids trying to get my attention, etc--not from the quality of the mics themselves.
I am using them with Sony MZ-RH10 minidisc. This rig replaces my aging and more voluminous cassette-based system (Uher CR240 + Marantz PMD430 decks, Nak CM300 mics).
Cheers,
Jeff DLB
(1st Taperssection post)