I have both. FAE is great.
As for the RVC...I have a Sanger V210...and the HSE RVC has issues with the Merc EMS / ignition noise. I supposedly need to get a signal gen that connects to the alt to make it work right.... HSE contacted me...I have just not gotten around to getting the part ordered...reason being running a wire to the back of the boat is going to be a pain to do right...given how I have my boat wiring set up... I am not one to just string a random wire. I like things tidy. To put the wire into the existing loom, I will have to tear my entire boat apart! Sure would have been nice to know this when I had it all apart last year...
I have been on other boats where the RVC worked as intended...and it was great.