hi cal,
had bluefin on for about 9 months now, went with them as I had it on my mini cooper before so just had to send back old handset and they sent me a new one for a reduced price.
easy to use in terms of set up and also taking it off when you go to stealers and then putting back on but takes about 20mins each time, revo switch is alot quicker but with them the software always remains on the car where as when u return bluefin to stock it completely removes the map.
performance wise there has been some issues, had it RR in October and only hit 271bhp with tbe milltek, sent me a new map and is good very progressive wise but not too aggresive but have not had chance to RR,
Today though I have just been sent the revised stage 2 map thanks to stevep visit the other day to SC, which has alot more torque so am looking forward to giving it a wizz!
good customer service though always respond to your issues quickly,
hope that helps
