I would like to upgrade as well, but I am looking forward to 4.4 on my RMHD first. I updated my wife's phone from the Razr M to the Moto X. That has been a very nice improvement.
You'd get some incremental upgrades like "shake on" camera, no touch Google Now, active screen notifications, etc. but you'd lose your SD card storage. That's not enough to get me to switch, but YMMV.