While most of the microphones with a good reputation often costs twice or more than these ones, the Behringer XM 1800S is actually not a bad choice for beginners.
I've been using these mics for over a year now and I have yet to experienced anything bad with them. These mics are easy to use, feels great in your hand and comes in a handy box. The fact that they all have on/off switches and a clip for each microphone included in the package is also nice feture.
Of course, if you are a experienced singer this is probably not what you're looking for, but for the beginner band, or someone who just want's a couple of cheap microphones to start with, this is a great deal.