APR is good but you're paying for a full service option and a reasonable marketing budget.

I did start to go down CC path, however became problematic when tune file for my car was not straight forward and file needed to get written from "scratch". Car and tuner were no longer in same place and it all got too hard (really not prepared to put an untested flash file in my ECU without a back-up plan).

So in the end I went with Viezu - partly because of hardware (they are the only ones that do DP for Tiguan).

Pluses and minuses for each option. Comes down to personal preference and what your priorities are on performance/$/service/upgrade path/etc.