Talking to a tuner on the subject their view was that the ME ecu's were very good with variable valves etc so are required for st170 engines and the like, but would give no benefit on a basic turbo engine as it is simpler to control so an older ecu will do the job, depending on what functions you are after. I was told that Emerald customer service is slow, Omex is very good but they now prefer DTA

As usual the advice is to speak to the person who is going to map the car