I used Superchips for my 58 plate 320d auto (177).
The map and power delivery from it was excellent - I had it rolling roaded just prior to the map at spot on 177bhp. Straight after the map it was 215bhp.
I didn't keep the map on my car as I didn't like the way the auto box reacted to the extra torque. It didn't like it and changes were harsh, coming in with a bang. The box didn't seem to want to learn either so I took the map off and got a refund. I am sure it would be fine on a manual though - it wasn't the map, that in itself was great - just my auto box. FWIW Superchips don't raise the torque any more than their competitors - I just didn't like the way my car dealt with it.