Recoil Compensating Mounts

Anyone know anything about the recoil compensating mounts for springers, such as Bullseye ZR. It says in their ad they have droop compensation built in. Is the droop compensation as much as the DNTO6 that Diana offers? How durable are they and do they work? Which others are out there? I do value your opinion. Thanks
 
I have one and it seems you'll be limited to the scope you can mount. I wanted to use a Centerpoint 4-16x40 but it's to wide under the turrents (center) so doesn't sit in the rings. I have a Centerpoint 3-9x32 that does fit it and tried it out on my NP XL1100 but that gun needs some work so I took it off. I have a Hawke 3-9x40 AO that is shallow enough but not long enough to fit the rings. Luckily you can undo a set screw and move the rings closer so I may try it with that scope on my Nitro Venom .177. I haven't put in enough shooting time with it to say whether the poi moves over time so it looks like I have some shooting to do.
Pros-
does adjust out some barrel droop, picatinny rail
Cons-
limited to scope size
I wish someone would make a picatinny mount like this:
Beeman 5039 1-Pc Adjustable Mount w/1" Rings, High, 9.5-11mm Dovetail
Have it and it is very nice... have my scopes optically centered and used the mount to get on target.
Greg