I learned what I was doing wrong and haven't used in the past 3 years. Among things I did with it was record my shooting motions in a Glock (GSSF) Indoor League. Now that I've more or less nailed down my problems it sits unused. I CONSIDRED it, like taking a class from a pro, money well spent to find out what I was doing wrong.
I'd forgotten they make a flat surface rail. I may go back and work on my revolver skills with that.
They've added a new features and stuff in the past 4 years and I haven't kept up with them.
PRIOR to Mantis, but I had tried two different laser trainers. One that was a simulated cartridge (9mm) and the other was muzzle mounted. Don't remember the make/models of them, but were the popular selling items at the time <2020. I flat out wore out the 9mm cartridge one. Used it in a Glock and a Sig to the point it wouldn't react to the hammer fall half the time. The other one also had reliability issues after a while also though I don't now why. I junked them. I think the newer ones may be more reliable. I notice Mantis offers a system and if I weren't doing so much live fire I might try there's out now.