I've got two of the Viper Oval ESCs and apart from the slight inconsistency issue (one has brake, the other doesn't!
) I've not had a problem with them.
I wouldn't spend a penny more on my 'dave until the powers that be decide what's happening with the rules. £40 is still £40 if I end up being the only person racing brushed and need to go get myself a new ESC...