Sadly it would appear that even the V.3 Mamba Monster isn't without it's issues, apart from the MGM I'm running now the only B/L speedo's I've had previously have been for 1/10 (Novak/LRP/Nosram). There are a lot of good reviews from people using the Tekin speed controllers.
As I said I went for the MGM as it's water proof, I don't know about the Tekin but the Castle one's certainly aren't. The other thing that steered me towards the MGM was the fact that Tekno, who's chassis I'm using, prefer to use these. Thermalling shouldn't be an issue as it comes with twin active cooling fans.
Someone asked about run times, I've got the LVC set on the conservative side at the moment so it's 13 - 15 minutes.
__________________
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.