I thought you just wrote previously that you had 24 hour turn around time from them? 24 hours would be pretty darn good to me.
Regardless and all joking and poking aside, the proof will always be in the pudding. And on that note, it seems that most have been very happy with Stratified with stock turbo tunes (probably not as much data points to know for larger turbo tunes). I will always want something done "right" than "fast" any given time of the day...
As an area of improvement, Stratified can do a better job of setting customer's expectations. I.e. - when you send them an email, you get an auto response email stating, "We are working in a priority sequence and your next iteration will be built as soon as possible. Please keep in mind that the quality of each revision will not be sacrificed in order to have the fastest turn-around time." This is good since you at least know they got it. As an area of improvement, it doesn't give the customer any indication if this means 1 week, 2 weeks or more. Does "priority" mean "first come first served" or does it mean something else? Are BMW, STI or Porsche owners a higher priority that VWs? It leaves the customer wondering and in suspense and not ideal in a customer service oriented business. I'm in the industry and have received similar feedback at one point in my career. So some clarity in setting expectations would go a long way in helping prevent misunderstandings.
Just my .02!