My big concern with the E-Z box is the lack of adjustment. I looked at one at French Lick and was told "If there's slack, send it back... opening it will void any warranty." There is no adjustment without disassembly and shimming changes, so taking up any box slack after a few thousand miles of the gears and bearings polishing themselves in is not possible like it is with my Gemmer boxes. That being the case, I'd put the money in a proper Gemmer box rebuild and nice new round, polished steering balls riding on the available teflon ball seats. Add a new shorter pitman arm if you must.
To me, opening the hood and seeing "E-Z Steer" is just another step away from originality, like alternators, odd fans, 16" wheels, etc. If you don't mind (or care) the E-Z Steer may be for you.
I do not see or follow the "Like Power Steering" analogy. The advantage of true power steering is less effort with a QUICKER ratio, not a vastly increased ratio that makes the car drive like a bus, requiring large angular movements of the wheel to accomplish the same minor steering corrections. Both E-Z and short pitman arms make the steering less responsive and more sluggish while cruising, even if you have virtually zero free play.