Since I just received the PnP machine last week I don't have enough experience yet to give you informations about prices.
But yes: The PnP machine places all SMD parts which are not too high f.e. electrolytic capacitors. I didn't try double-side-partmounting yet.
Regarding your comments:
I use external optocoupler for MIDI I/O
Micro-SD Slot is on the back of that PCB
J6 & J7: I made some pcbs with faders which I connect directly to that connectors.
There is no "current" version. It's a proof of concept, which worked. So I used the circuit around the STM provided in this design here in my other projects.