So far I've used it to mic up
acoustic guitar ( a pair of em, one on the 12th fret & one pointing at the soundhole about 6 inches away), as a heavily compressed & distorted vocal mic, and as drum overheads.
They do a great job at picking up fine, close-up detail, but also perform well capturing the room.
I doubt they'd be as effective on a small-bodied acoustic, but on a jumbo they work very well, with none of the boom that other (more expensive) mics I've used for miking up my guitar have produced.
I should add that I recorded the guitar in a very small, *dead* room. When tried in a larger room, they picked up too much ambience - probably 'cos they're wide-cardioid condensors.
As the md of ADK said in a recent post, if they work for you, you've got a bargain.
I couldn't agree more - so much to do with getting a good recording is in performance & mic placement, and I really feel we often get hung up on specs & "gear" issues.
When you've got at least a half way decent mic, the rest is up to you ( either to perform, or get the best out of your client)