I decided to try copying about ~350GB of movies from one network share to another. 7200RPM drive on one side, SSD with 660Mbps read/write speed on the other side.
Through the toughswitch, I was seeing an average of 300-480Mbps. Not terrible, but fine.
Then I ran the WS-12-250-AC. It was averaging 800-850Mbps very consistently for what turned into about 3 hours of testing. It didn't break a sweat!

I've already had one post praising these switches, but I couldn't help another one

Thanks again, Chris. These are such great switches!!