The dot is that small. You can use it for very precise hits, and supposedly the oval/circle can be a crude rangefinder, but I haven't played around with that yet.
The PK-AS is a real bitch to adjust. Either you must remove your receiver topcover (I don't feel comfortable firing with it off) or you must remove and then replace the optic on the rail between each adjustment. You must loosen a set screw, use a special tool to make an adjustment (no "clicks" either) then tighten the set screw and reattach the sight.
Another feature of this sight which is unique is that you can adjust it for elevation after it is zeroed. This mechanism is why it must sit either to the left or very high. It is an interesting concept, but difficult to get used to.
I bought one from Tomac and he just bought it back from me!
I still have another one, though. I am going to try it on my Tigr carbine with cheekrest as a conventional right-eye dominant optic.