Fairly new shooter observations of USO SN-3: I like the way the GAP ret is set up. Kind of like what Premier did back in the day with the Leupy, with a few more neat features. Glass is super, as would be expected with all high end optics such as Nforce, Schmidt&Bender, Hendsoldt. Big and beefy, but i'm not willing to drop test this baby on purpose, but would back up what M700 said. EREK knob in .25 works for me for what I do, but get what ya want/like/get best use of. More MOA adjustment than the cartridge is capable of. Fairly smooth adjustments for elevation and windage, but absolutely repeatable every time,that was a huge sell for me) I can't get to 1k w/a single turn on the EREK, but I don't need too. Twist and hold to 1k you ask?...yep, sure, no sweat with the GAP ret; can Hold Only and get 1k,if I did my math right...but i'm not that good yet,someone better could verify i'm sure)). Summmation: Tank tough, user friendly, clear, dead nuts repeatable optic with a price to match. What more could a guy ask for!!{My shooting experience has been limited to a train up from Vern Harrison @ CVT, and some informal personal practice at Quantico. Less than 1yr in the long range game, but loving every minute.} Maybe this helps ya, maybe not.