Wish it worked with subsonic ammo. Be nice for rimfire too.
disclaimer/disclosure: I am the manufacturer of Silver Mountain Targets. If you want to be kept apprised of our forthcoming personal e-target system, you can find a sign-up form on our website.
Open-sensor electronic targets can only work with a bullet that arrives at the target supersonically. To detect a subsonic bullet, different sensing technologies are needed (closed chamber targets, or light/laser sensor arrays, or impact plates). This is because a subsonic bullet does not produce a shock wave as it travels through the air, therefore there is absolutely nothing that our sensors are able to detect.
An open-sensor e-target system thrives for shooting at distances where you can't easily see your bullet holes (which depends, but typically 300Y+). If you can see your bullet holes while you are shooting, the truth is that a piece of paper does an awfully fine job of many of the things needed by a target. (yes, an e-target can do more things than a piece of paper even at 100 yards, like measuring the x-y coords of every shot that you fire, even if a bullet goes through a hole in the paper... but these are more advanced things, and I wanted to be forthright about not underestimating the usefulness of a simple piece of target paper!)
The natural market and application for a personal e-target is centrefire rifle shooting at distances of 300+ yards/metres, whether it is load development, practicing for competitions or other serious long range shooting, or just the pure joy of long range shooting and plinking. They can do a better job of pretty much everything a long range target camera system can do. Compared to shooting steel, you don't get the satisfying ping/splash/knock-down, but you do get a precise indication of where your bullet hit. And compared to driving a car or ATV or snowmobile back and forth to a fixed target, you can get a lot more shooting done in a lot less time, and you know the position of each shot as you fired it.