Does anyone have experience with these mounts?

I use a DNZ mount on my Tikka 308 and have no complaints. Its light weight and so far has held the optic fine.

I have one on a T/C Encore and one on a Marlin 336.  No problems at all and seems to hold zero very well after multiple hunting trips.

I use one in my Browning T bolt...no problems.

I've had one of their mounts on my AR10 for a few years now. Mount holds strong, very light, and nicely machined.

Currently using "http://www.dnzproducts.com/freedom-reaper-mounts/forward-ring-picatinny-rail/freedom-reaper-5-66-picantinny-rail-1-inch-black" with a Nikon Scope on my DD M4.  In a couple days, it will be replaced with a Larue Tactical LT104.

I like the fit and finish of the DNZ, but want to have a QD mount, since my primary optic is an Aimpoint H-1 (on a Larue QD mount).

Will likely mount a spare Leupod in the DNZ and toss the combo in the closet.