I have been having great luck with the user interface, Exchange, programming, everything.
My recommended changes are purely physical at this point.
When assembling the unit, it says something to the effect of "put the lower shaft into the upper, it will only go in one way". ACTUALLY, it will go in 2 ways and one of them will get the parts stuck together. A picture here would be worth thousands of words. Now that I got it together, I see how it works. As a new owner though, it was quite odd.
Also, they need to build a better grip/screen support. I see why people are complaining that they break. I am a big guy and have somewhat muscular arms. I have felt like I was going to snap the handle in two on numerous occasions. I also have an issue with the length of the forearm rest. It simply does not go long enough to fit my monkey arms. I understand that they cannot possibly build the machine to fit every human on earth, but I would like it to be able to go bigger.
I HATE the battery chager interface and the fact that you must remove the battery for each charging. Why can't they put a charging jack on the unit itself? Plug a cable in, but not remove the battery. Plenty of other manufacturers of consumer emectronics do that while also making the item waterproof. I understand that LioN batteries take a special charging circuit and Minelab probably did not want to include that weight in the unit, but a suitable chargeer could still be made which allows the battery to stay in place and keeps the charger weight out of the machine.
I also do not like the headphone jack that comes with the unit. I want to remove that (I use the wireless anyway), plug the jack where the waterproof headphones attach, and have a waterproof unit I can use with the internal speaker. Unless I missed something in the box, I don't believe it is setup to do this.
Other than that, I have enjoyed the ergonomics of the unit.
All in all, I know that I am VERY picky and can find fault in ANYTHING, but I really do love this machine more and more.
WM