Version 4.0.4 is called ICS or Ice Cream Sandwich. It's a big improvement over v3.2 HC or Honeycomb with smoother and faster performance. It also improves the overall look and feel of the firmware. If you haven't done it yet, I highly recommend a 'factory reset' to wipe the Tab and setup the firmware with a fresh installation. It means you need to backup your data, and you'll have to re-install your apps again and setup the screens again, but it wipes away any remnants of the old version and gives a clean setup. It also helps to eliminate any potential issues.
Welcome to ICS!