<p>There is a lot of nonsense about this issue, most of which comes from folks who have never owned a button rewind M2. I bought mine used in 1973, S/N 938XXX. The button does not have to be held down on my camera during rewind. I also have an M4 which I bought new in 1967. The M2 has been trouble-free through the years and is the one I use with the Visoflex III, Bellows II and 65mm Macro Elmar for flower photography. The build quality of the M4 is not quite as good and I had to replace the viewfinder on it due to separation on the prism. The lack of a self timer was not an issue for me. The button rewind M2 was one of the best cameras that Leitz ever made and the newer versions only added the self timer feature. If you are looking for build quality rather than "features" there are no better Leicas available than the M2 button rewind model. While photography is just a hobby for me I have put well over a thousand rolls of slide film through my M2 with no problems whatsoever.</p>