So I know I've seen a few posts about guys using the x3 and x10 from Mantis, anyone have any experience with their Blackbeard system? If so what are your thoughts? Also what distances have you been able to use it at?

Love it. Works great and adds that extra level of dryfire training

One complaint was, out of the box it would cease regularly. Doing some research, read that a bit of grease on the contact points would resolve it. It did. Also, may have been more prevalent on earlier units.
Looooooong charge of the battery/mag, but has held pretty near zero over my front sight post after quite a bit of dry fire. My range (indoor) is 75ft and seems pretty stiff on the target; point of aim matches point of impact.

Neil