Used this with my Leica M9 and several different telephoto lenses. Works great and having the built-in diopter adjustment is wonderful. The view is sharp, clear and as good as the Leica 1.25x and 1.4x viewfinders. It can be used with the a 35mm lens on the M9 and and that pretty much fills the viewfinder.
$90 shipping and paypal'd in the US. US sale only.