The ITarget arrived a couple of days ago and I have been trying it out as time permits.
The device itself is very simple: a paper target on a frame with a smartphone holder that points teh camera at the target. There are no electronics in the device - it relies on the iTarget program in the smartphone. It comes with a single laser point round in the caliber of your choice. I bought it with the 9mm round and also bought a .45ACP round to use with my 1911s.
I use an iPhone 5S. The mount holds the phone securely, but it seems the phone camera is a bit low so I had to tilt the phone backwards. I still can't get the entire target to display on the phone unless I zoom out on the camera and then the image extends beyond the edges of the target (which they say you shouldn't so). I fiddled with it a bit and will do more in the future. Whatever, it works OK.
The software is magic. It plots (on the phone) where each shot lands and even plays a pew sound when you fire! I assume the program, through the phone camera, detects the laser impact point, plots it and displays it on the screen. It seems to be quite accurate.
In a couple of days I have found that my skills are getting very rusty. I had to work of grip, trigger and front sight focus to get close to where I used to be. What's nice is I'm not burning up any ammo, can shoot in the dining room and improve basic skills whenever I want.
Never having used the high price spread shooting simulators, I don't know how it compares. I paid $165 including shipping and the second laser round. I'm glad I bought it and would, so far, recommend it for indoor shooting practice.