First of all, WELCOME to iRV2. You will find alot of good people and info here.
I have had the Hughes autoformer for several years now. Knock on wood, havent had any problems with it. I do believe this type of unit is a must for some of the campgrounds we visit. Many of them have a low voltage issue and without a autoformer, you are running your A/c or whatever on a lower than prescribed voltage which will eventually prematurely wear out the fan's etc.
Mike
P.S. Along with a autformer, you need a surge guard. The surge guard, if you can only afford
one or other, is more important than the autoformer to protect your rig.
Check out
http://www.rvupgrade.com for both the surge guard and the autoformer.