Hi Vikki
If you mean hotelclub.net, then I have used them many times and have had good prices and no problems. I usually check with other sites as well and hotelclub is often (but not always) the most competitive.
I went to Amsterdam a few weeks ago and used them with no problem - in fact the hotel had my name and didn't even want the voucher.
In response to Kirsty's answer, I think that you have to be careful when you book the hotel. Some hotels will show as immediate confirmation (if the booking button is red) and obviously confirm immediately (!!) Others will say booking will be confirmed within 24/48 hours (if the booking button is blue) Again I have never had a problem.
In addition, you are able to collect 'member dollars' and after a few trips, It will often pay for a free night somewhere.
Good luck and happy holidays