Yep, its not going to be cheap.

Why is it better than 2 rx/2batts?
It uses on rx at a time. If that rx fails, its switches automatically to the second, thus *complete* TRUE redundancy is achieved rather than loosing half the airplane (same concept for the batteries), and with only one rx active at a given time, it eliminates the (perceived IMO) range loss of a dual rx system.
It amplifies the signal to the servos.
It provides short circuit protection.
It regulates voltage (selectable) to the servos and the receiver - separately. Can be used with LiPo or NiCad or NiMH.
It allows for the use of two separate rx's on different freqs that can be selected during flight with a switch on the tx, making a very interesting "buddy box" possible.

IMHO, all together in one little box, that is a lot of warm fuzzies on a GS airplane. I dont think the cost is worthwhile for anything under a 40%, but for my $6000 models it seems to be a small price to pay.

Roger