I think that consumer sales went to EFI in 2012.5. However, they continued to sell non-EFI to golf courses in bulk.
So, you might find a recent used non-EFI but it will have started life sold to a golf course for rental purposes.
I think that axle based drum brakes started in 2015. I have a 2015 and you can lock those things up. They are very good. However, several repair guys have said that they have never had to repair the wet, transmission based brakes. So, I would not worry about that.
I think(?) that Drive2 and Quietech started at the same time. I also think that with the introduction of that model or year later that high speed gears were put in the transmission at the factory. Prior to that, the transmission had to be split apart to change the gears at the retail location. They also then came stock with 10" steel wheels rather than the really not good 8" tires.
These changes are well worth the money and the re-sale value. I would buy new or a year old.
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