I was part in designing traffic for their site - it helped to get good results at first time, as well they have all features set up from beginning so i can focus more about user experience rather then coding issues etc..
They are very helpful when you need some help or advice (like what is best plugin). Their prices seems like overkill but hey thats just me :) If u want professional service check this provider! As far my case goes everything went smoothy since day 1 ;) no problems really only minor one which took few hours/weeks solving after getting paid by client :P Thanks guys keep doing your job!