I have used 99designs twice now. The first time was when they ran a cheaper pricing model and I was initially reluctant to spend $295.00 minimum on a logo design. As the logo is the company brand and is an important mark of the company, i decided to lay down the cash and hope for the best. In the end, i recieved 110+ designs from 17 designers which gave me so many different design options, and in the end i selected a design that blew me away and was much more than what i had expected to get.
Although the cost is higher than when i first used the service, the calibre of designs and designers is also much much higher, and well worth the investment. The web interface is extremely easy to use and 99designs takes you step by step through the process. 99designs is a fantastic service and highly recommended.