I love all of the changes implemented in WP8.1, but I'm not going to do the developers preview unfortunately. I'd rather wait until all the bugs are ironed out.
People seem to be complaining about the skinned live tiles being a customization option. While it may take away from the uniqueness of live tiles' designs from each other, depending on the background chosen, it may look pretty sweet. Although, I'd love to have an option for an actual background instead.