This is a fantastic service especially for smaller organisations that don't always have a large budget for design services. The fact that you can work with a number of designers all at the same time is a quite amazing. I don't know anywhere else that you could do this.
Product : We have used 99 designs a couple of times now for both a new logo and flier design. We were blown away with all the amazing creative concepts submitted and extremely happy with the results we received. I would recommend 99 designs to anyone.