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The canon EF-S 17-55 f2.8 is a very sharp lens, even on a high pixel density camera like the 50D. The Tamron is a sharp lens too, but I suspect it won't match the canon in sharpness on high resolution sensors. Whether it's worth it to you to get it or not is purely up to you. If you're not going to make prints larger than 11x14 then keep the Tamron, IMHO.
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2007 Volvo V50
Taken by ex: 2005 Toyota Prius.
R.I.P. 1997 Lexus ES300. 
R.I.P. 1989 Acura Legend Coupe LS.
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