my MB dealer is annoying - I would get phone calls that they want me to come in and they would adjust the clock on my car (for daylight savings time).
the clock adjust is free of charge, they then try to sell me services which I find annoying.
but - if this service is like an email and has a history track like e.g. whatever notes you write there (brake pads, fluid change service on date etc, oil change etc) then its good.
I still use a pen and paper for this purpose.