For many years I used a sigma 50-500 as my main (and for a while only!) lens. I had very few issues with image quality, and found it to be a tough and durable bit of kit. My son now uses it as his main lens on an old 350D.
Over time I covered the range with other lenses, but that is the expensive way of doing things (70-200 f2.8, 120-300 f2.8, 500 f4.5, and 1.4 and 2* TCs - all sigma). Dont shy away from third party lenses until you have tested them - I have found there to be very little difference between sigma EX and canon L series lenses, other than cost!
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