Ive played with exactly ONE of those, again just setting up a buddies gun. Setting up the scope was easy, and really besides the thick crosshair (necessitated by the drop compensation led), and RELATIVELY poor glass, Its an accurate and easy to use system once set up and dialed in, especially with a spotter.
(going from what i remember)
The scope works by connecting to the range finder, so if your phone ISNT present it runs off of stored data. If your device is present and the app is running it will pull data from the outputs of the app.
The thing does work, and is pretty reliable from what Ive seen and been told.
Its not fool proof tho.
My buddy is relatively new to both hunting and shooting, and by that I mean he's really only got seriously into it in the last 5 years or so. After I set up his rifle, the next time he took it out was hunting on another island, and proceeded to miss a bunch of shots. Many of which he probably wouldn't have if he had one of his regular rigs. His issue was trusting the scope's holdover compensation, but his inputs werent correct. After he got back, another friend of ours who is much more experienced with using a ballistic app and shooting distance went thru it with him and fixed the problems.
The system also only compensates for the easiest thing TO compensate for. Drop is the one thing that's close to constant, and might as well be out to 500yds or so. With modern high-intensity cartridge trajectories, MOST guns with a 200-250yd zero will only show something like 3-5moa above/below POA out to 400yds, and 3-7@500.
That isn't to say that its NOT a good system or helpful, but personally my major nemesis is wind drift, even at the relatively short distance of 300-400yds. Ive completely missed more than one sheep, and a pile of targets on Maunakea because I've fired directly into a sudden strong gust I didn't know was coming until it blew me sideways.
I would also rather have to remember which stadia to use, or how many clicks to add/subtract, and get the slight but noticeable glass improvement, and slightly less bulky scope.
Again personal preference, my previously mentioned buddy loves his, and has taken some animals at well beyond what Im comfortable with simply because his SCOPE new his drop tables, and all he had to do was make the shot, which is not insignificant.