Drum - I deleted a couple of posts where there was no new content? No problem but something went wrong!
The thing with all the small electret mics is that they can sound a little harsh - but only on some sources. They're generally not nice on vocals, but can sound really crisp on some (not all) acoustic guitars. overheads on drum kits sizzle nicely, but good cymbals seem to work, but the cheaper, more metalic ones sound a bit thin and kind of artificial.
I've got lots of different cheap ones and they all have this characteristic. With a good dynamic like a real SM57, you can stick them on almost anything and they do a good job, but condensers can be a bit selective. However - at the price, why not buy one from somewhere who do returns with no hassle. You'll know if you like them straight away, and if you don't, send it back.