I hadn't seen any posts on this specifically. I had asked about it and got some mixed responses. I figured I would make a post and hopefully be of help to others. This is not an advertisement nor am I associated with Mantis in any way.
This is going to be a bit of an ongoing journal on my experience with the Mantis X10. So far I have had it for about 7 days and overall I have been fairly impressed with it.
The Mantis X10 is a small clip on accelerometer, for lack of a better way to describe it. It detects the movement of the gun in the moments before, during, and after trigger press. It can be used in both live fire and dry fire. It also provides feedback in the terms of a "score" on how each shot was as well as notification and tips on the movement and direction it detected. It has several modes and different "games" you can play, it makes dry practice a lot more interesting. It pairs via bluetooth to you phone and has an app that goes with it, which is free to download. It is feature packed and even has a holster draw mode to measure your time from draw to shot and the score of the shot. I have not played with this yet, so I can't comment to it as of yet.
After getting it in, it clips onto the rail on the front of my Ruger P95. It comes with attachments in case you dont have a rail as well. From what I have experienced it is a very sensitive device. It detects minute movement, almost to the point of being overly sensitive. My first day with it I was averaging in the 60s and 70s for a score per shot (out of 100). Some of the tips and suggestions it gave were clenching my fingers on trigger pull, slapping the trigger, to much or to little trigger finger and other suggestions. Following the advice and suggestions, my sights have become more stable through the trigger pull and afterwards. I'm up into the 80's and 90's now which is a much faster progression that I was getting dry firing on my own. I can visibly see the stability of my sights improve.
Live fire is a bit different with it. While there is some correlation between a good score and a good shot, they are not necessarily the same thing. I've missed the center of the target by and inch or so and scored a 95 for the shot. So, there is some variance there. I do find that the higher the number typically means a more accurate shot but not always. It will audible read out your score after each shot if you set it up to do so. If you are going to use it for live fire, I recommend a bluetooth set of shooting muffs so you're not looking down at your phone after each shot. I have only had one live fire session with it, but my groupings have improved a bit. I like the fact that it is instant feedback. Also, it is pointing out that my live fire movement is different than my dry fire. While my dry fire movement tends to be down a bit or to the left, live fire shows it a little up and left. This is different than what the target shows so I need to look into it more. I need to use the recoil meter on it and see if its picking that up and emphasizing that as my greater movement error. I am scoring lower on live fire than on dry, which is to be expected IMO. You can also pull up each shot individually and see the movement track of the gun throughout the shot which is nice.
A few negatives I have found so far. First is the battery life is annoying as hell. You can fully charge the thing and the app reports a lower percentage than the 100% it should be. Each time you turn it on, it will give a different charge percent. I thought it was an issue with my unit, but a replacement did the same thing, so its something about how they measure the charge. The charge does last a full 6 to 8 hours despite what the charge percent says. Another negative to it does have a habit of reporting a false shot now and then. I've only used this in DA mode, so not sure if it happens in SA. It has occurred both in live fire and dry. I would have to say its 1 out of every 50 to 75 shots, and it has nothing to do with the stability of the gun, its something about how it senses a "shot".
Another thing with its sensitivity is that it will ALWAYS find an issue with your shot. While it is helpful in that it tells you why it marked you down, it is annoying that even on the 99.9 I have gotten once or twice, there is still a negative mark for something.
So far I think its been a worthwhile investment from the dry fire standpoint. It has helped me stabilize the gun and sights through the trigger pull and the moments after. I have a little over 750 dry fire shots with the unit so far and the improvement has been faster than what I was getting on my own. It also sets an alarm, should you choose, to remind you to practice each day and has badge courses that you work on over time.
I'll update this more as I continue to play with it.