Took my 159 into NJS at Pershore for the remap - after countless months of wondering if it was worth the extra cash over the "standard" high street maps.
Have to say im amazed the difference in the power delivery and the way the car drives is night and day! I had the remap and EGR disabled - left the DPF in place as ive had no issues with it and am still 50/50 on the possible MOT implications. The car pulls much better in every gear, delivery is smoother and seems to come in earlier and lag out of junctions is a thing of the past (may be related to the map or the egr or a combo of both).
The car is a 2010 2.0jtd 159 Ti. Didn't bother having it rolling roaded because im not too fussed on the exact figures, Neil reckons they produce around 210 with the remap and it definitely feels quicker although its the drive-ability that's impressed me the most. Oh and the average mpg appears to be on the up on the standard work drive to the train station.
The service from NJS was excellent, courtesy car provided, even though it was a fiat
whilst they did the works and kept me up to date with the progress of the job. Was all ready to pick up at the agreed time in the afternoon.
If you thinking about this and still sat on the fence get it done.
Only negative is i may have to budget for a new clutch next year - noticed some very slight slipping in long 4th gear pulls - although the car has done 118,000 miles so imagine the clutch is probably needed anyway and the map has just highlighted it.