I think that one of the best features about the Bluefin device is that it can be removed very quickly to make the ECU look normal.
Not having to tell your insurers that the car has been chipped can save you a small fortune. Please note that I do not condone this, and I tell my insurer everything, but I have a few friends who have bought the unit simply because it is so simple to switch back to normal.
If you're going to keep modding, and if you're willing to spend big money, i'd imagine the Revo system is better...or at least that is the feeling i've got from most of the users on SCN