One issue would be the webcam placement, it's below the screen.
If you get the XPS 13 don't make the same mistake I've made, don't waste your money on this POS http://accessories.euro.dell.com/sna/productdetail.aspx?c=uk...
Linux support is very bad, it uses a proprietary technology. Get a USB-C to HDMI adapter instead.
I just switched to the XPS 13 as well and picked up the WD15 which is the same price on Amazon. The WD15 officially supports linux and from what I read is better than the 3100 as long as you're on a more recent kernel. Hopefully I won't have to return it.