Summary: Bottom Line? Great for live applications and very convenient for quick set ups and a reliable sound. Not so hot in the studio because of its inability to really grab that thick low-end sound you look for in your toms, especially the floors.
Pros: These mics are very convenient and clip right onto toms, snare, congas, ect. They have a pretty good response and ton on toms smaller than right around 14'. These are great in live situations, especially for venues that will change drum kits 4 times a night - easy to take down and set up - no mic...
Cons: These mics lack low end definition making them not so good for studio application. They also tend to pick up a long of vibration from the rims and have a rather high self-noise. Great live, though!
Excerpt: These dedicated snare and tom mics are pretty much just cheaper priced and cheaper sounding Sennheiser 421's. They do have some of their own virtues however. They are dynamic mics, and they will connect with an XLR cable. You don't need to have phantom power running for these ones.