[OH25shooter]

Has anyone used either of these optical shooting attachments? Any pros or cons?

Here are the two in question: http://www.championshooters.com/optical-iris.htm

[MutinousDoug]

I have and used the Merit optical attachment for Bullseye when I shot that game some years ago and was happy with it. It did an excelent job of increasing the percieved depth of field between the front sight and the target. The adjustable iris worked well but the suction cup could smudge the lense of my glasses which sometimes was a problem unless placed close to where you needed it to begin with. The other device I am not familiar with; It looks more sophisticated (i.e. complicated) and looks like it may be sensitive to eyeglass frame type? But may save you that lense smudge issue I just mentioned.
The Merit is useless for position rifle shooting, so unless you are thinking about using these for pistol shooting, keep looking.
HTH