Specifically is this Sigma lens any good??

https://www.sigmaphoto.com/lenses/le...05&navigator=2

I want a lens that gives me a large focal range at a decent price and it seems like this lens handles the zoom of both of the lenses I have. I really only use my camera, Canon Digital Rebel XT, when traveling so having multiple lenses isn't ideal, but I would rather have two lenses of good quality than one of bad.

Any help on this lens or suggestions on other lenses is much appreciated.