I'm running a Link G4+ Thunder on my cossie.
Reason for changing it was down to reliability as all new sensors off the shelf rather than copies of the originals as can't buy genuine 3bar maps sensor new. Now have wide band lambda control, coil on plug, Ecu controlled boost.
The car runs and drives so much better as tuning can be much more accurate then on older stuff and also engine protection strategies like oil pressure, fuel pressure and others give peace of mind.

All that said, it will only be as good as the person mapping it so regardless of what Ecu you go for, make sure the person doing the mapping has loads of experience and is excellent with the brand you decide to go for.

A fancy aftermarket Ecu is only as good as the person putting the info in to the Ecu at the end of the day !