Depends where you to and your budget but its a well tried out process with many companies carrying out remaps successfully
Personally speaking, I am Revo through and through, mainly because they are the best locally to me.
I had my 8P at stage 2+ for over 60k miles with no issues what so ever (370bhp)
My Porsche Cayman S and Scirocco R were both stage 1 and my S3 8V will be getting the same treatment soon
Dont go for the cheapest option, thats my advice