Add-on light meter

[RML]

One thing I learned from my stay in Mongolia is that my Leica M2 is a nice enough camera but IT NEEDS A LIGHT METER! Damn you, Leica, for not keeping up with technological progress! (Maybe I better go into hiding now?)

I hardly shot anything with the camera simply because it was a pain to take out my handheld meter for almost every shot (the contrast between sunny and shaded areas is immense in Mongolia), especially at -15 degrees C. I mainly used my Leitz Monilta CL and Bessa R, simply because they have internal light meters.

So now I'm looking for a stick-on light meter. I saw the new CV light meter ($159) and I'm wondering wheter anyone here has any experience using it or the older CV meter.

Also, does anyone have one on offer second-hand?