Sidewinder SV2 vs Castle Sidewinder SCT vs HPI Flux Motive vs Duratrax Element etc

[fastbaja5b]

Am looking at a waterproof brushless esc for my Wraith, now the stock location is for an Axial AE2 esc which is essentially a rebadged Sidewinder without the Brushless (or fun) capability.

Problem is, I see SV2 Sidewinders and Duratrax Element as non waterproof, but HPI advertises their new Brushless with the Flux Motive as "waterproof"

So whats the difference and which one can (should) I use?

Does the HPI sticker result in some sort of voodoo magic that causes water to stay away??