Im not sure how I would feel about the Masterforce being loaded heavy. Drawers definitely seem less sturdy than my SnapOn. Mine is loaded pretty light though so its a non issue for me. Other than the top that has 3-4 1/2 inch impact sets, 6 3/8 impact sets, about 7 impacts, and other random wheel sockets. That's under a flip up top though, not a drawer.
Ask your tool truck owners what they have for used or have coming up. There's always someone wanting to upgrade to the newest and best thing if they can get rid of their old box. My SnapOn guy regularly has 10-15 used boxes sitting in his shop for sale.
Any of the Mac, Cornwell, Snap On boxes Ive seen looked fine to me, as long as they werent the bottom of the barrel options.
Never seen any in person but the internet crowd seems to like them. Prices look damn good.