just got my 2015 diesel yesterday ... love it!
I actually bought it over the internet long distance, never had driven a diesel wk2 (but had a 2011 wk2 6cyl briefly for work). got it shipped. The reason I was wanting this rig so bad is when I had my 2001 WJ I really wanted to convert it to diesel, so when I found out they had diesel in the wk2 (I sort of left grand cherokees for a while) I had to have one.
i don't see a problem with the shifter, figured it out no problem - rather than looking at the shifter you just look at the display. I can see why rental fleets would want to avoid it, but even then it'd be a fast learning curve as it's very intuitive.
anyway, have only put about 150 miles on it since yesterday but I'm shocked at how much power it has even at 85 you can still get up and go (on econ, haven't turned that off).
the QL is pretty cool too. So, at least right now having owned it less than 24 hours ... love it