Anyone here have  a CQB by Leupold?   I borrowed one from my buddy & I love it! Any opinions? Any known  PROBLEMS or ISSUES with this sight? Looks battle worthy....

Do a search on CQT or CQ/T. Lots of opinions.

Positives:

-very clear glass
-1-3x variable, good from CQB distances out to 300+ yds
-waterproof, fogproof
-built like a tank
-excellent FOV
-illuminated reticle for low light use; standard etched reticle for daytime use
-lowest levels of illum are NVG compatible
-takes standard AA batteries

Negatives:

-14mm objective lens (although this has never been a problem for me)
-eye relief a bit short (although no worse than most ACOGs)
-long tube design (only when compared to an Aimpoint or EoTECH at CQB distances)
-sits high on a flattop, especially when using a QR mount
-heavy
-can't mount PVS-14 behind it unless you put the CQ/T on railed fore-end

Neither Here Nor There:

-battery life (600+ hours at medium settings - similar to EoTECH, nowhere near Aimpoint, but reticle does not need power to be visible during daytime)
-parallax (at 3x - but this is the same as any magnified optic)
-reticle - it's simple and can be used for basic rangefinding, but a new reticle is promised
-accessory rails - I've never used them for anything, but they're there if you want 'em

Around $600 for one of these - they show up regularly on the EE in new or like new condition. QR mount from ARMS is about $135, but you can sometimes get this thrown in when buying a used scope. Larue Tactical has made mounts for the CQ/T before, but they're a very low priority item right now and will not be available in the foreseeable future.