Yes it's a good sharp all-around lens, but it depends on what you intend to shoot with it. For general landscape and scenic photography it's great. For people photos, maybe not so great. If you have an active lifestyle and want to cram the most versatile lightweight and compact lens into your bag, it's great. If you're looking for pro quality, maybe not so great. If you like to walk around a lot and shoot whatever you happen to see, it's great. If you don't mind switching lenses when you need to, the 18-55 and 55-200 combo offers better overall image quality for less money.
I personally don't own one and have never shot with one, but if I did a lot more business travel like I used to I'd definitely have one. It tends to be a love it or hate it lens. Also beware of sample variability. Complicated design + cheap consumer build = lots of sample variation. Some people get them and say it's the sharpest lens they've ever owned, and others get one that are quite soft. If you get one, just make sure you've got a good return/exchange policy from the store you buy it from and test it thoroughly.