I've had good results with Celtic Tuning. Bluefin, in my estimation, is pointless. You can control the torque delivery and therefore fuel usage with your right foot.
Scenario: You're driving along the A9 with your car set to standard mode. Up ahead there's a bunch of goods vehicles you want to pass swiftly and safely.
So you now have to pull over, stop the engine. Use the bluefin device to upload a higher performance map.
Restart the engine.
Drive off again and spend 5 minutes catching up with the goods vehicles which are now a long way ahead and with even more cars to pass before you catch up.
Unless you have other drivers in your car whom you wish to 'restrict' in terms of torque and power then Bluefin is a little bit pointless.
A well sorted remap is superb for everyday driving and will not damage your fuel economy at all. You can get the throttle response curve changed to suit your driving style at remap time.