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Haven't had the chance to test them. My understanding of how they work is that I'd have to take my glasses off still, but the diopter replaces my glasses prescription. Which is soemthing I don't want to be doing as I can do that now.
YeahNerdz-
It allows you to get your eye closer to the eyepiece which means you can see the frame lines. The diopter does replace your glasses prescription but it's not the same prescription because the diopter interacts with your eye and the focus patch in a different way.
I couldn't get the glasses on no diopter combo to work as well. Long story short, in most cases if you're shooting outdoors with glasses on in good light you're usually shooting at smaller apertures to the point where the camera operates as a point and shoot. If you're trying to dial in a noctilux in a nightclub then you need to have a very good view of the focus patch.
Airhead
Do you use a diopter on the viewfinder? I got one for my M bodies (they are transferable) and it helped with focus and the framelines. If you go to one of the Leica dealers they have a few you can try.