Windows Vista is here to stay so if you are purchasing a new computer, its a good skill to have. Off course it may not make you more effective but its fun trying something new but probably only on a new computer. Anyway one of the neat features is the aero look. But Aero comes a price, lots of extra resources which may not be there if you have 2 or less gigs of Ram or an older computer.
Here is an article that describes how to turn back the clock to the less hungry Windows Basic look