When I was in KwaZulu-Natal last year there was occasionally
some flare on my M6, but to be honest, I've never thought it a
problem. The finder on my M2 seems much brighter.  Either way
the cameras and lenses themselves are so light and easy to use I
have always just excepted it as being how it is! I started using
screwmount Leicas years before the internet, and so have never
had a problem with on-line reviews!  I suggest you go to a
camera shop and just try one out. The only problem with that
course though is that as soon as you hold it, you'll have to
have it!