I bought a new 1322XR for the 2015 harvest. Overall, a great cart! The reach of the auger and visibility are excellent.
The only problem I had was with the ladder to get into the cart. It has a nice way of latching and getting out of the way, however..... when you look at the ladder in the stowed position, it is the lowest part of the cart by about 4" to 6". So about on the 5th day of use, the cart got stuck in the mud.... ladder was the first thing to touch the ground...... was twisted into a pretzel.... and is now in the junk pile! In hindsight, it would be very easy to shorten the ladder a bit and make a small bracket on the frame for the ladder to fit into so it isnt twisted up when the cart is stuck! Hopefully something you can integrate into future models.
Another suggestion would be to make the tie down hooks on the rear of the cart hooks large enough to accommodate a large clevis or pin to hook a tow strap to. I know they aren't intended for pulling, but like it or not, the tow strap is attached somewhere on the back and the cart pulls out combines on an almost daily basis!