When they work, they work beautifully...
But the operative word there is 'when'. I'm gonna try and keep this concise to help people decide on the product. I bought 2 of them for what it's worth as well.
The pros:
They DO work. And when they do work, they work really well. Virtua Cop as an example, once everything is calibrated right, You can point the guns up to the screen, close one eye, and have perfect 1:1 of where the gun points to where the bullet impact shows on the screen. That was better than I expected.
Having two of them, there seems to be no conflict with each other. Set one to Channel 1, the other to Channel 2, and even sitting directly next to each other in the PC, with other wireless devices around, no dramas on that front.
They're REALLY kind to batteries. I've had the same set of cheap alkalines in my guns for over a week now, with quite frequent use everyday, and they still show no signs of dying out.
The Cons:
The unsigned drivers are atrocious. And it's not just that you have to put your PC into test mode, they're just crappy barebones drivers. There's an entire D-Pad on the guns that is literally unuseable because "a mouse only had 5 buttons so what can we do", and that might be a good enough reason for some, but get this, I'm holding a mouse RIGHT NOW with over 15 buttons on it, all programmable and workable to do whatever the hell I want. Don't say something isn't possible because you couldn't be bother to implement it. :p These virtually useless D-pads really irritate me. Supposedly you can map the D-Pad for example to Mouse1, Mouse2, Mouse3, Mouse4 that way.... yeah.... sounds completely useless to me as well.
If you're on windows 10, and want to use two of these, you're gonna have a bad time. Something has changed about the way Windows 10 handles device migration, so once you leave test mode, then go back in to reapply your drivers, and the device migration does funny windows 10 things, demulshooter will stop working. I had to downgrade to Win7 for this.
And finally, probably the worst thing about them, and I think it probably hearkens back to the awful drivers - They're literally "buggy". Every half an hour so, your mouse goes to the top of the screen and spams left clicks even when you haven't touched the guns, and the only way to get your mouse function back is to turn the gun on and off, sometimes twice, sometimes both of them.
For all of these reasons, I'm gonna have to give them 4-stars. If you're reading this "review" then you're already a lightgun enthusiast, and in this regard you will love these guns.
But the cons are very real, and afaik there's no way around them (I'm trying to write an autohotkey script atm that will maybe make the D-Pads useful, but I'm not having much luck so far).
If you REALLY want wireless, and you don't mind working around the hiccups of the drivers like I have to, by all means by this. The wired "alternative option" will probably cause less headaches in the long-run though.