Sometimes I regret that I didn't buy an M6 when they could be had for 800€ or so (5 or 6 years ago). I think the window of opportunity to get one for a reasonable price has closed, and the prices will go up in the territory where the other hyped dream cameras from the 90ies are - Hasselblad Xpan, Contax T3, Mamiya 7...
But my Minolta CLE that I bought at that time instead is still going strong - the best purchase I've ever made in classic cameras. Even if it fails some day, I shot more rolls with it than with any other camera I own. Used cameras are always a gamble, so enjoy them while you can.