You won't notice much cosmetic changes. The main changes are in the hardware
driver support & stability. There are a lot more device
drivers so more hardware is supported/installed without the need to install seperately after installing 7077 (e.g. anything from 7000 to 7057 would not recognise my Wireless LAN, 7068 & 7077 install straight away). Also you'll notice increased performance, startup/shutdown is now faster, Media Center runns a lot more smoothly. Those are just a few i've noticed, if you read through the different posts regarding 7077 you'll get a really good idea of what you're asking.