I would definitely use kik'lop_design again! I chose their design from 208 entries!
I didn't know exactly what I wanted and it was my first time using 99designs. kik'lop_design provided several designs early on in the contest that had potential to be great logos. I provided requests for variations, sometimes because I didn't like part of the design (such as a particular image) other times just to compare the design to other ideas I wanted to try before committing to a final logo. kik'lop_design responded quickly to all my requests and made the changes I asked for.
Once selected as a finalist kik'lop_designs continued to work with me in a timely manner to put the finishing touches on the logo to make it what is is today. I would highly recommend kik'lop_design!