I've never used it off road, but occasionally in my garage I use a cordless drill and a lag hook plus the bottle jack. Basically the same thing.
I would just use the manual jack off road though. It's not a race. Simple is reliable. I wouldn't want to carry that around for the rare chance I'd use it. (I also wouldn't carry around a big floor jack on a sled to pretend I'm racing either. And frankly I don't know why any racers do. I don't think jacking time has probably ever determined the outcome of a desert race.)
This surely looks interesting. At home, I need two fast to use jacks. My main jack is great but my HF aluminum racing jack, the lighter duty one, is about done. I do carry a regular hydraulic jack at all times in addition to the OEM one, but having something like this on trail could be super handy.
Last weekend, I replaced my 600lb 6112 springs with 650lb springs using the no-spring compressor method. I would not trust this jack to help with that, but it sure does seem great for tire rotations and all sorts of secondary jobs.
EDIT: Google offers 20$ off if bought through them. Expires tomorrow.
Since it's my wife offroading by herself in the 4Runner, I'm more interested in an electric impact wrench that can remove lug nuts. She can get the manual bottle jack to work.