I had mine done by Angel Tuning also about a month ago, well pleased.
Took it for a 1500 mile cruise around France, pulled like a train on the motorways still averaging 48 - 50 mpg. Wicked.
Quite a lot of smoke comes out the exhausts when you power down though, thats the only draw back. Seemed to me to be thowing out excess fuel.
Went back to Angel and had the fuel/air mixture adjusted slightly which fixed fixed the smoke, still trying to gauge if i have lost any power with the adjustment. Its hard to tell.
Is there anybody out there who has had a similar thing to me? Wots your thoughts?