Different trims get different sizes. The lower trims get an 8in, and higher trims get the 10". Both are a new "landscape" setup with a revised dash though.
In general I like the Uconnect the best of those I've used. The system in my wifes Nissan Rogue isn't terrible, but it's not great either. I dislike GM's system (mines old, but even the new ones aren't great). Fords has gotten a LOT better in the recent years. I had a '12 Focus with some of the first Sync tech that Ford used. It was atrocious and was a general PIA. The new systems are significantly better.
@seanmclean is right though. There are some peculiarities to the UConnect that I wasn't a fan of. The heated seats is a really obvious one for me as well.
Of course I'm an "old school" guy, and would LOVE to have a high trim vehicle WITHOUT a screen at all. I hate the added interior light at night time, and I hate functions under "soft buttons" that change based on what screen you're on. Give me some physical buttons, with a nice red tinted backlighting, and let me drive instead of trying to operate an iPad to turn down the A/C, adjust the volume or otherwise adjust the vehicle systems.