This was the first DSLR that I had used. It was a friend's, and I really liked it. I then was a photographer at a camp and they supplied me with a Nikon D5000. I used that for a couple months and then decided to to buy my own camera. I went with the Canon XSi, because when I had used it earlier it felt like a good quality camera, and it was a decent price. I was still using the D5000 then I got my XSi. I went out to shoot with it and wasn't as impressed with it as I had been before. I don't know what it was, but it felt light and flimsy.
The image quality was pretty good, but the reds seemed to be really strong and that's saying a lot because I am partially color blind to red. I was able to take some pretty amazing pictures with it.
Then kit lens that came with it was not that great, but that is to be expected with a kit lens. I never had any blurry pictures with it. With a Canon DSLR, there are a lot of lenses that will fit the XSi.
The display on the XSi feels huge. It displays a lot of information, but it looks clean. One thing I would like is the top display like the Canon D series has. It was very bright and got annoying in the dark. When you bring your face close to the camera, the screen shuts off. It's a very nice feature.
Changing settings on the XSi can be really easy or really hard. Changing aperture, shutter speed, and ISO are dead simple. Changing things like white balance, resolution, quality, etc. is hard. You either have to press a small button that isn't labeled or go through a couple menus.
The XSi uses a SDHC card. They are pretty cheap and common. And most computers have readers for them. They are more reliable then the Comact Flash.
Overall, this is a good entry-level camera for those just getting started in photography and want something better then a point and shoot. Overall, it's pretty simple to use and learn, and with its wide support of lens, it make upgrading easy.