I bought this to hold a gimbal and action camera combo to use with my bike and some activities with my dog. It's very well made and the straps are substantial but easy to adjust. If I was going to make one suggestion or wish, it would be to include some other mounting points on chest plate. Even some small holes for zip tie mounting of an external mic or battery pack would be great. I'm currently experimenting with improving the audio of my activities and the chest plate is a good hard point for keeping a mic from rubbing on my clothing. Still, this is the best game in town for holding a gimbal.

This is a game changer in the stable shots but man it make you look fat as it rest under your pecks and makes them look like tits

Did what it was suppose to do. Use it for recording K-9 trailing.

I bought this chest strap to take with me on my trip to Costa Rica next week so I don't really have much field testing with it. I can however review it from a running point of view and a from a gimbal mount point of view. I have the flimsy chest strap that comes in all those eBay package deals and those are terrible when running and you can't mount a gimbal to it without it flopping all over the place.
The Stuntman mount is very secure. The "˜soft plastic' they advertise is really a somewhat flexible rigid plastic. It's nice because it doesn't dig into your chest, probably the reason they made it. But it's definitely hard enough to where it will hold a GoPro or gimbal very steady. The straps themselves are well built and about twice as thick as the cheap one I already have. When I put the thing on it also just fits better and feels much more secure. The mount is also much more versatile in that you can adjust where you'd like to have the camera or gimbal sitting. I've always thought that RAM Mount should build one of these and the Stuntman crew beat them to it. But if you've owned a RAM mount the mounting mechanism is similar. So you can crank that mount down and it won't move at all. If there's something to be said about RAM mounts it's that they are tough and steady, this is just like that!
Testing:
1) I ran with this having my GoPro Hero 5 and there was no bouncing around at all. You can't even feel the GoPro on there which is so nice. The chest strap also doesn't look as weird as my cheap one for some reason?...maybe because it fits better.
2) I hooked up my Feiyu Tech gimbal to the mount and you could tell it was on there when the GoPro was attached to it. But it wasn't flopping all over the place. I was doing jumping jacks and running up/down stairs and it was a little heavy but the gimbal is a little heavy so I'd expect that. The gimbal would be perfect for when I'm mountain biking where there is a lot of jarring.

Overall I give this 5 stars. It's worth the $$ if you're doing any rigorous activity or need to hook up a gimbal. Great job Stuntman team, I will recommend this to anyone who will listen.

And I'm not paid for the review or have any association with Stuntman.

Very stable mount for your gimbal. Comfortable and the strap systems is sturdy. Don't feel the plate moving off my chest very much or any at all like others on the market.