I have a 536 and while it does have a couple quirks, I'd recommend it.
#1 don't trust the factory loc-tite on the mount, re apply it yourself.
#2 the eye relief is tricky if you use a fixed stock, if yours is adjustable should be no problem.
From my review of it in July of 2013:
The 536 optic is a well made, rugged looking piece of kit. It came with a sunshade, flip up lens covers and a lens cloth and the battery already installed. There are 3 rail sections for mounting additional accessories. The mount is solid (see above) and the instructions included torque settings for installation AND the scope can be mounted to a carry handle. If it matters (it might) there is a cleared marked "made in China" sticker on the mount. I suspect that means the WHOLE unit was made there.
The windage and elevation caps are safety wired to the scope, the rear of the scope is a focus ring.
The rear lens cover is difficult to snap closed for some reason. A military style diffuser is available for the 36mm objective.
Adjustments are 1/4inch clicks at 100 yards.
The illumination is available in red or green or can be left off (black) ie you still have a cross hair even if the battery is dead. I shot it with the red setting on 5 (brightest) and the black. Turning the illumination turret is a deliberate action, it will not move 'by itself.'
The glass is coated and optics very clear. The center dot does NOT cover a 2 inch orange target sticker at 100 yards, it was easy to select each circle and engage it. The 'crosshairs' are heavier than I am used to and the fact that they are not connected to the edges of the field of view takes some getting used to.
The BDC is calibrated for 55gr M193 or 62 gr SS109. The top of the center dot is for 100 yards, the bottom of the dot for 200, the next dots down 300, 400, 500 and the hole on the outer ring a "peep' for a 600 yard target.
