I sure do miss my window borders.
Don't get me wrong, I love translucency, but to me the biggest improvement I've felt from Big Muscle's software is to be able to create compositing resources that include a visible border. There is no substitute for visually finding the window border for resizing, etc. I can't tell you how many times I've been frustrated by trying to grab the corner, no, inside the corner, no just outside the corner, only to have a window underneath jump up unexpectedly or something.
-Noel