I put up a contest on 99 designs for their lowest package, the $295 one (I've heard that you get what you pay for, so if you're looking for more than ~15-20 designs for your contest, you should buy the more expensive packages). I also bought an admin template from themeforest for $20 that I needed the logo to match.
I'm not sure if I didn't communicate my idea clearly enough in the contest or even if I just didn't know what kind of logo I was looking for, but none of the logo's stood out to me when my contest was over. I ended up finding a unique font on some font site and it ended up fitting perfectly with what I had in mind so I created the logo myself.
I requested I get my money back guarantee from 99 designs, but never heard from them. I left them multiple messages and called their office multiple times during their business hours but they never answered or responded (You'd think that if a website is offering a money back guarantee and if they put their phone number up on their site that you would at least be able to get a hold of someone but I never heard from them at all).
Eventually I ended up getting my money back but I had to file a dispute with Paypal to get it.
EDIT: To answer your question, I created my logo myself.