I used 400d kit. I bought a Tamron 17-50 f2.8. I practically did not notice the difference in quality - I decided that they had screwed up and needed to save up for CANON's L-optics. Decided to change the carcass. Began to look closely at the 60D. I read reviews about 60D - I was disappointed and decided to wait for 8D (or whatever comes out there). I suffered with my 400D until one day I saw a photo report from "my" Tamron. Surprised, I went to look for the reason . I tried 60D and the lens "opened up". The quality of the photos is strikingly different, as if the "masterpiece" mode has appeared. Concerning the rotary mode. This is happiness. I love photographing mushrooms. Now you don’t have to crawl on your belly to find the right angle. You can enlarge the image for more precise focusing - very convenient. When working with a tripod, it is convenient to use the electronic horizon. If I listened less to the reviews of professionals who bought 60k as a second camera for 5D, I would have found happiness long ago :)
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