I used mpps 13.02 today for my e46 320d (150bhp)
i didn't try it with lov voltage (under 14V) so i went and buy an charger which can do slow, fast and start mod...
fast mod wasn't enough (20A) so i used the start mod of the charger, it was ok!
I was able to reed my ecu and i sent it away and got an modified file in one hour, load it up and went on a test drive.
the map was ok, good acceleration, im quet happy! So if do the requirements mpps is a good tool to remapping!
I used this kind of tools first and reemapad car first and was easy, but i was stersfull till i've finished...
its a cheap tool! I bught it from ebay for 35pounds