I am still working with 201 since I burned my fingers with all the bugs in the 2M? versions and soon regretted having switched to the M-releases too early. Still curious about 3M1, though..
Question to those who already use 3M1 in production environments: would you upgrade again? Is 3M1 an overall improvement over 201 to you? And what are the most important problems you expeirience (and their workarounds)?