I have had GAS for one of these ever since I held one in a local shop.
I kept telling myself I should be happy with my 350D and BG-E3 grip but it still felt too light and small.
After trawling ebay I found this one for sale and the seller was buying a new 400D so I got it for a fair price.
As many have said the overall feel is so superior to the 300 and 350D, it also feels much tougher. The 2.5" screen is amazing, you can actually get an idea of what your pics are like, most unlike the 350D. The controls are much more logical and easier to use due to the better layout. I love the ISO range, again a huge improvement over the 350D and it's ability to focus and meter in low light are a big advantage too.
I'm am so happy I bought this camera and I've only had it two day but already I have improved my pics, highly recommended.