Check the review.
I have never used that lens, but if you're looking to get ONE lens for all, this is it. Then again, it is not practical to carry it "everyday". You know how heavy the camera + lens + flash can get !?!
and its 28-300... unless you're getting another 10-22mm super wide? or you're using 5D MKII or another FF body..
Not to mention, damn, $2400 too!! (I could get the 17-55mm f2.8 + 70-200mm f2.8 IS USM, which will cover 98% of any shoot!!) Not to mention, both of those 2 lens will take sharper pictures probably, especially in low-light situations.