I did my first Revo uprgrade on an A2 diesel yesterday, wasn't sure how well it would perform, but very pleasantly surprised!
The ecu has to be flashed out of the car but as its under the passenger footwell, its quite easy to ge out.
The customer was so impressed he was pushing the money at me before I had to ask.
The gains are quite good, 33bhp and 27lb ft of torque. makes the car very responsive.