Decided to try a mid-drive about a year ago, and procured a BBS02 from emax ebikes in AU (excellent vendor). Built up a Nashbar steel frame with medium-level left over 8-speed parts, then Luna Cycle opened so finished it off with a 52V, 10 a/h battery. Topped out at 30+ mph; replaced the 46 tooth chainring with a 30 tooth and spaced the cassette with 11-17-28 gears for a straight chainline. Riding dirt mostly; tops out at about 22 mph and ascends anything that I've tried.
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