I've used these microphones on just about everything over the last few years. They work very well as drum overheads, on acoustic piano, three as a Decca Tree, spots for acoustics instruments, pretty much anything which requires a little lift in the top end. For the price they are an excellent buy and i would would recommend them highly as a general stereo pair for most applications. The patterns offered are useful for lots of different stereo techniques and the capsules also have slightly different frequency responses (dependant on the pattern you choose to use), which i often find very useful.
My only issue would be that the build quality of the clips is rather poor; the threads fail and the metal is weak.
As mentioned, they are fairly bright in the top end which doesn't suit everything but they compare very well with much more expensive microphones. If you want ruler flat response and lower signal to noise then you will have to spend a lot more money to hear much improvement.
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