I have used a lot of different espresso machines, but do not have much experince with the Cimbali M2. I have used the Schaerer extensively and find it is one of the best super-automatic machines. It is relatively straightforward to set up (and adjust and maintain) and does not drift quickly from a decent cup to something undrinkable. You may require assistance for the initial set-up, and as with ALL machines - after sale service and on-going maintenance, repairs and parts availability are essential factors. As another indication of reliability...Dunkin Donuts has placed several thousand machines. That also segues into training and ease of use, pretty simple.
Of course, I would rather use (or be served) coffee from a nice traditional espresso machine prepared buy a skilled barista! That said, if you are not going to invest in the labor of bartista skills, then the capital investment in a superautomatic can be a reliable second choice.
Further recommendation: avoid automatic venturi style milk foamers, they generally do a sub-par job and clog easily.
ALL machines require daily cleaning regimens, and superautomatics MUST be cleaned by their recommended schedule or else the beverage quality and machine reliability both suffer (and your profits will follow suit).