The MGM's a good choice, they're nice ESCs. What model do you have?
I went for the 16025-3 Z Series, I thought about going for the 28025 but mine should still have 45-50 amps to spare on what the Neu motor will pull. From what I've heard it's not as smooth as the MMM although I haven't noticed any cogging as it spins up prior to the Tekno clutch engaging. I've got some long shank pinions to try direct drive as well which will probably show up any cogging more than the clutch will.
If the V3 is sorted it should be excellent for the money and if it is indeed sorted I may well get one to try.
As far as waterproofing goes I had a Novak GTB before in 1/10 TC that was supposed to be 'water resistant', was it hell, first drop of water and it went up in smoke! The MGM should hopefully be better in this respect as it's also suitable for use in R/C boats, time will tell I've only run it in the rain once so far.
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Losi Eight T - Nova Rossi P21-7T- Hitec 5955's & Spektrum + TeknoRC Losi 8ET - Neu 1515-1Y - MGM 16025 & Hitec 5995's.
RC Heli's - Align T Rex 600 Nitro Sport - X-Cell Spectra G gasser.