I have an Angel Tune done over a year ago. I can honestly say it's great but I didn't go OTT requesting a mild state of tune so as not to place undue stress on clutch, driveshafts etc.
One year and 15K miles on no smoke (well - only if you kick it after pootling about for a while. But that is norm for any diesel I think), no lag, reasonable economy (although suspect my MAF may be misbehaving as I struggle to get over 40mpg). However she goes like stink and can pick up smoothly and without fuss in 5th from 30mph. The power delivery is very linear so the car is deceptive so it doesn't feel particularly quick. One look at the speedo tells you otherwise . .
Recommended by me and I would use Angel again.