Great on kick. I've never used it on snare, but some say it's good on snare. It's a great mic for my voice ( a bit nasaly). Great on toms and congas. You can't miss with this one. Go for it if the price is right.
Whoops.... I didn't read carefully. I thought you meant the MD 421 rather than the 412. Forget all that I said, never used the MD412.
They look like the original MD-421 large diaphragm dynamic mics, which are GREAT mics IMHO. I've owned and used 421's for years, and have used them on a load of things, such as rack and floor toms, kick, vocals, guitar amp, and brass instruments. If you can get the original MD-421 (not the MD-421 II) in good condition for a reasonable price, jump on them.