I'm not seeing what the big fuss is about. FWIW, the new UP "flat wheel" sound boxcar I just picked up has diecast trucks, hidden uncouplers that are removable, and the Kadee mounting blocks. The couplers seem to work well, they couple very easily, and don't come open, at least in a 20 minute test run with a pair of track cleaning cars behind them to provide a drawbar load. At least this truck design, to my way of thinking, isn't really all that bad.
John watch my review of the Milk trucks. Those couplers a JUNK. I'm not so much concern with the trucks themselves but those **** lobster claws. And as for easy conversion to Kadee. Yes easy until you notice the spacers don't bring the kadee to the correct height, at least for my two bay hoppers.