I've had this mic kit for nearly 5 years, and everything is working as it should (I should say though that 3/4 of the rim clips have broken now). The quality you are getting for a sub £100 microphone kit is crazy!
Kick drum mic - Depending where it is placed this microphone can either be full of tone and sub or have a real tight punch with a nice present bass to it.
snare/tom mics - These microphones are lovely on toms, they pick up a nice deep tone with a punchy attack. On snare these microphones are lacking, they don't produce the right attack for a nice snare drum sound.
Overhead mics - now these are the gems of this pack, I've been tempted to buy another pack just for these two microphones, they work on every aspect on the drum kit - Overheads, Snare, Hi-hat, Room Mic etc - But I have also had great success applying these microphones for vocals! they have a very full sound with a crisp high end that is just pleasing to the ears!
I would highly recommend this microphone pack but would advise getting a different snare microphone to go with it.