I purchased the 60" 7 Iron deck last fall when I bought my new X748. My previous tractor was an X595 with the 62C mower. In my opionion the 7 Iron is a vast improvement. I also had basically the same mower on a 4300 compact utility tractor ten years ago.
The 62c on the X595 and 60" on my 445 were pretty good mowers but the underside of the deck had too many baffles, rivet heads on other obstructions that allowed for the clippings, sludge as I call it, to accumulate. If one is able to mow when the grass is bone dry it is less of a problem but there still is accumulation. If you mow with the slightest bit of moisture the sludge accumulation is worse. It really has to be cleaned after each mowing.
The 7 Iron deck is a wide open design. The accumulation of sludge is mimimal. I took the deck off to sharpen the blades a month ago and I had about a half of a dustpan. That was the first time this year. ON my 62C I would have had 3 scoop shovels. It is amazing the difference.
I believe the quality of cut is a little better as well. The 62C does a good job but I believe the 7 Iron is better.
Attaching and detaching is as easy as the videos show. I was a little nervous at first to drive over a $2100 deck. But to detach the mower is less than one minute. Attaching is little more difficult as you have to allign the lift arms into the slots on the mower as you are backing up and over the deck. It took me a few tries to figure out how best to line up but now can do it on the first try every time.
The gearbox is also quieter. I'm not sure if it is a different design but you can tell the difference.
Yes it is $500 more than the 62C but I believe it is worth it.