I just have the one M2 but I would like another FFF printer. I'm printing molds that have lots of parts and while each part fits on the bed and prints quickly, there are a lot of them and it can take a while to print the entire mold. In my case another printer = double my speed.
The M2 is an obvious choice but what I really want is a whole print farm and for that it's too expensive. So I'm sort of in a holding pattern right now.