I purchased mine used about 3 years ago. I wore it daily for 2 of those 3 years. It runs accurately during my ownership, despite not knowing its service history.
Like you, I couldn’t live with the manual movement so I ended up getting the reduced.
I know the service cost is expensive, but it’s not any more than any other versions of Speedmaster, at least when going through the Omega Service Centers.
I think I’m in the minority, but I love the numerical minute markers present on the Reduced and the 3511.50 (Speedmaster Date). Of the two, I think the Speedmaster Date wears and looks better, but that’s subjective.
Go with the Reduced (or one of the other automatic versions like the Date or MK40). They are not as in demand (thus cheaper), and there are plenty of examples available to purchase.
Good luck with your search!