I meanwhile got my MS-3 and I like it a lot. I was always considering the G-System but stayed away due to additional costs with racks and cases. The size was a counter argument as well.
The MS-3 is the perfect Mini-G-System for me.
The effects quality in the delay/chorus range is excellent. I found even the OD - not the DS - which is digital working for me. The bass octaver tracks fine for me as well.
Excellent features are the "Current number" and "Assign" which allow you to stack effects and to trigger additional settings either on/off or momentary.
A sort of EHX Freeze is available as well and great when using the momentary feature.
"Assign" allows you to go from Clean to a whammy with Fuzz and Delay. Endless combinations possible.
Programming on the device is intuitive and straight forward.
Summary: my board got dramatically reduced - no Digitech Whammy, no Nova Delay, no Chorus anymore - all sold. Only the drives and filter are left.
Cheers
Wolfgang