Hi Ron,
I have to be honest, I love it!!
Unfortunately, it's taken me a long time to get our installation upgraded to 3.5 (long story!) and the upgrade took place the day after it was released, so we haven't upgraded to that yet, but I'm hopeful that we will be able to do so in time for the next academic year (We have to keep the old version on our development server for some assessment resits).
However, I've got a local install on my Surface using Xampp. so I get the best of both worlds!
I really like the differences to the themes, and am thrilled with the developments to the bootstrap template. That said, I've been so busy running training on Xerte and Storyboarding to prepare academic for using Xerte that I haven't had a chance to really dig in. For example, it was only yesterday that I came across the Xerte LO showcasing the bootstrap template and I really need to play with it....
All good from my end :)