I own several of these mics - total of six, I think. I've been very happy with how they sound on everything I've tried. I use them mostly for live reinforcement, and I don't experience any unusual feedback or side-spill.

Grand Piano - two of them mounted directly to the harp; one pointed at the left wall, right over the place where the strings cross; and one pointed at the hammers from about 18 inches away, somewhere in the top three octaves (depends a lot on your piano - you have to experiment). Great stereo image with really accurate and detailed sound.

Double Bass - mounted under the bridge, pointed at the center of the instrument body. Beautiful, rich tamber with crisp attack and detailed thump. Arco passages have a hint of bow without heavy overtones. Quite nice.

Cello - again, mounted under the bridge (through the arch), pointed at the instrument body, with the capsule positioned around the end of the fingerboard. Sounds like a cello should sound, rich and resonant with detailed overtones and a lovely rasp with heavy bowing. Couldn't ask for a more natural sound.

Flute/pennywhistle - mounted below the tuning slide, toward the embechure, pointed at the player's lips. very clear and accurate. Use a foam cover to avoid puffs of breath from the musician.

Guitar and ukulele - mounted on the bottom of the lower bout, below the saddle, pointed at the fretboard. Use a soundhole plug to avoid howling (typical with guitar). Careful to not bump it on stage. Very accurate, so use it on nice sounding instruments - it will only make a bad instrument sound worse by amplifying the unpleasant parts.

These mics sound really good. If you know how to place mics for live sound, you'll find all kinds of excuses to use them.

If you need a great microphone for a grand piano, you really must give these a try. I've used some instrument mics styled like this one costing 4, 5, 6, 10 times as much that didn't sound one bit better than this one. I bought two but ended up only using 1 because I don't need tons of low from the keyboard because we have a bass player. Both of them yield rich, percussive tone that our system lovingly shared with the whole room and with the band. No feedback issues (cut 250 and 500 narrow and kinda deep) but our piano is literally 12 feet from the left main. Piano lid on short peg but it would work with the lid all the way closed. Enjoy! This is a problem solver.

I have been using this on my acoustic guitars and compared a recording using this mic verses a pair of very expensive mics and to my surprise, this clip on mic sounds excellent. It is fairly easy to clip on, no hum or hiss, and records with a very nice clarity and good balanced sound. Great alternative to the hassle of setting up mic stands, and sounds more natural, in my opinion, than using an under-saddle type pick up.

For many years I've been trying to mic a grand piano at our church for recording during services. As they only allow the piano to be open on the half-stick, I've only been able to attempt to mic the grand from outside of the piano. I tried pzm's under lid, but this best works with the lid closed, so that has not been an option. We don't amplify our piano, but I've also tried piezo systems for recording. Also, not an option. Piano-specific microphone systems are available but range from $800 Audio Technica to a $3,000 Earthworks system. So when I came across these cheapo mics, I figured that I'd try a oair to see what kind of results I'd get. Sonically, they were not too distinguishable from the pencil condensers that we would use for intentional recording in which we'd open the lid. These have an oddly hot output, so I had to pad them on the way in. Other than that, I'm just still working on placement. I don't know what these sound like vs other piano mics, but right now these are more than what anyone would wish for if micing a piano for sound reinforcement. My problem is that i need to make coherent recordings of a live grand piano on a half-stick in a room of 200 people singing along and all the leakage and room issues that go along with it. I try to mix the singing in with the piano and it had been sounding really incoherent until I installed these mics. Now I get a very uncolored piano sound and somehow I don't hear the sustain pedal either(Yay!), which highlights the reduced sensitivity in low bass these little mics have. They need to be placed "just right" to get good dynamics. Last, but not least all connectors and wires are thin and flimsy. Take extra, extra care or you will break something. For the price these are, uou'll put up with it.

Remember that you need phantom power for this. I plugged into a phantom power unit and then into a measly 15 watt practice amp--and WOW! The sound was amazing when I had the gain at only .5. I was having trouble mic-ing my mountain dulcimer and this is the solution. Great buy! I might add one or two more to the gig kit just in case. So happy with this!! And it's tiny! If you're trying to mic dulcimer, fiddle, mando...anything with a small body, do this! You can get different attachment brackets from heim for other instruments, like horns, etc.