I would personally stay away from these mics (and also, that website - I dislike anything that sells "DJ" equipment as it implies cheap to me).
I don't know what application you're planning to use these mics for, but I would recommend looking at mics by Shure, Audio-Technica, or Sennheiser. All of these brands are highly reputable, and are likely to last a long time. You might be interested in the following series:
Shure
Good:
Shure LX Wireless
Better:
Shure SLX Wireless
The
LX series is a great introduction to wireless systems, but the disadvantage to it is that its frequency is fixed, and you can't change it if something is causing interference. That said, we don't have many problems with the six systems we have in our
auditorium. If you're going to use the wireless systems regularly, though, I would suggest getting the SLX because of the numerous advantages it has - including the ability to select from something like 1,000 channels and the ability to tell from the receiver how the battery is in the transmitter.
Sennheiser
Good:
Evolution G2 100 Series
Better:
Evolution G2 300 Series
Both of these systems are frequency-agile wireless systems, with not much difference between them. THe main differences between the 100 and 300 series' is that the 300 series has more preset channels spaces, a rack mount kit, and a 3 step battery indicator on the receiver. YOu can compare them on the Sennheiser website.
Audio-Technica
Good:
1400 Series
Better:
3000 Series
I'm not too familiar with Audio-Technica's product line, but the two above systems seem to be similar to the Shure and Sennheiser systems I recommended above.
As far as where to buy, I highly recommend
Full Compass. I have purchased from them in the past for our school, and have nothing but praise for their excellent customer service and pricing (the price in their catalog and on their website isn't the price they charge - you have to ask for a quote to get the lower price). Give them a call, ask them to quote you some prices - and if the price is too high, they'll work with you to get the price down to something you can work with.
Hope this helps, and if you have any more questions don't hesitate to ask.