From a design perspective am very happy with the final results and the designer is very good at what they do.
I think my experience would have been better if the designer took a bit more time to guide me through the whole process as it was my first time. I found the answers to many of my questions being short and abrupt one word answers.
Sometimes concise and to the point is affective while there are times more descriptive interaction between the client and designer would be welcomed especially when new to the 99 Designs process and you're not sure what the right questions are to ask.
Having said all that would be happy to use the designer again in the future.