Nice equipment. I used to own an M-308, but at the time I didnt have much spare time to use it as I had hoped to.
Nowadays, I have an M-1516, which is a few years newer (early 90's vs mid-late 80's).
I imagine both models are evenly matched in functionality and features?
One thing I do like is the upright VU meters on the 308, they are easier to see, which is a nice feature going back to the Model 2A/MB-20 meter bridge, compared to the M-106 (only two meters and flat down, not upright).
The M-1516 is nice in that you can lift/carry it without too much strain & effort, its not too heavy despite its somewhat large appearance.