It looks fine, it works fine. You are able to edit the page with this translucent and draggable tool. A little eyecandy for you but beside all it's quite a useful feature! There is some additional information on the PRC panel displayed on the page: Page Name, Version, Page Template, Mode and Status (as you can notice on the screenshot below, this page is checked out for the user who has the permission to edit the page).
I've tested PRC both on Windows (XP SP2) and Mac OS X (10.4.11 and 10.5.2) platforms in major browsers (IE7, Safari 3.1.x, Firefox 2.0.0.x, Opera 9.2x).