I have the latest DTUK twin channel box on my F10 535d 313ps.
http://www.diesel-performance.co.uk/..._f10-11-313-ps
It is supposed to increase it to 350 bhp & 740nm.
The boost sensor is abit fiddly however once you know its easy to fit and remove.
The gains in performance are good.
I have had it fitted for 4000 miles now and had no problems. I have ran the majority of different maps on the box and have found that map 3+1 is the best, I have been running map 3+2 for a week now and it is slightly better than 3+1. I have already tried map 3+3 and although it was good, i received a 'Drivetrain Malfuntion' message after a 2 weeks of running that map and it put the car into limp mode. It is not the end of the world if this happens, just simply take the map down abit by the touch of a button.
I found map 2 was abit aggressive and when accelerating at low speeds it felt to snatch which i was not comfortable with.
Something i would recommend when you fit the tuning box, try a gearbox reset at the same time. All you do is switch the ignition on and hold your foot down on the accelerator for about 30 seconds and start the engine and go try it out. You will notice a difference.
Overall, I am very happy with the tuning box and i would recommend it to others.
There is also a discount code ASN80