Bisley works fine for me, I wear spectacles and never had a problem with it. Needs to have a slightly bigger gap between the end of the enhancer and your eye than a non spec wearer might choose but there's no contact and it does a good job of blocking out all light. I also have the tube type per Ratinators images on the Daystate so I can use it right handed and the lad can use it left but they're not as good at obscuring light.
EDIT: You need to make sure that whatever you fit doesn't make contact with your spectacles, depending on your prescription strength it can introduce significant parallax error if the angle of the lens changes significantly in relation to your eye if the enhancer is putting any pressure on the lens or the frame and pushing your specs back towards your eye unevenly. If I don't have mine in exactly the right place it can mean an inch or two of extra drop at 55 yards. I can still range accurately but the image shifts relative to the reticule. I don't know if everyone suffers from this problem, but I definitely do.
ISP Airstream MK III No 15 which is a bit poorly at the moment and having a rest
AA Pro Sport + Ginb FT8 stock + Bushnell 4200 6-24x
EV2 MK1 + Leupold Comp 40x
Weihrauch HW100 KT laminate
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Last edited by Monty; 7th November 2013 at 08:25 PM.