I have also opted for the Forge FMIC on my N55 and recently had the car on the rollers for a health check and to see if there was any gains at all over the oem cooler even though the software hasn't been touched (so just ECU adaptation).
The RR was a Dyno Dynamics set up (which gives similar results to the Mustang Dynos in the US) and I have already had the car dynod there both when stock and with just the DMS software flash tune.
Results showed an increase of 13-14bhp and 9lb/ft at the flywheel (10bhp ATW) which although isn't mind boggling, given the fact I wasn't really expecting any gains without the software being tweaked and that a uprated FMIC isn't generally seen as a power gaining mod as such, I was reasonably pleased tbh..
Not had any experience with the Wagner cooler, but people who have gone with their product seemed to be pleased from what I have seen. I don't think you'll be disappointed in either to be honest mate..
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