I have looked at several but so far I have resisted buying anything. Here are my reasons for not getting one:
1. Cost
2. Need to cycle the slide before each shot to activate
3. My dry fire is not just trigger presses, but a variety of stuff. I probably do more drills that involve draws, target acquisition and reloads than the trigger press.
I suppose if I could find a set up that would actuate the device with trigger pulls without racking the slide and the price point was low enough to be attractive to me, I'd consider it.
That Laser Hit looks like a nice set up. If you have a DA auto, it might work well.
If the SIRT pistol was not so costly, I would probably buy one.
I have the Strikeman system. I've been using it here and there the past month. I still feel like I need to get down to using it at least once a week, maybe multiple times a week.