Questions: M 50/2.0 - any good?

[Boris Liberman]

Hi!

I am about to be enabled with the above lens (SMC M 50/2.0). It is 
optically identical to A 50/2.0 and very similar (AFAICT) to 50/1.7. I 
wonder how come Stan's site has nothing to say about it and except one 
line on Alex's site I couldn't find anything in regular PDML annals 
<g>...

Especially of course I would be interested in opinions of people who 
have (had) and/or use (used) this lens.

Thanks in advance.

Boris