The Tamron 18-200 was the first lens I ever bought. I loved it at first but I can't recommend it. I used it for a little over a year and then I ended up selling it and getting the Tamron 17-50mm and the Canon 70-200f4. It's an ok outdoors lens but it has some problems I couldn't live with. The focus just can't lock on in anything but perfect lighting. This would drive me nuts if I tried to use it indoors, I would miss so many pictures. On top of that focus is slow, build quality isn't terrible but it's not great. It has a lot of distortion at 18mm and it's really slow on the long end at f6.3. Color, contrast and sharpness are all just average. It's a jack of all trades master of none type of lens. I don't mean to make it sound terrible because it's not, it's just limited to use outdoors in the sun. If you can get it for cheap enough (less than $200), it's an OK buy but I wouldn't pay any more than that for it. The Canon 55-250IS is a much nicer lens for around the same price. Yes you miss out on the wide end but you gain IS, a faster max aperture, an extra 50mm on the long end, and a sharper, better focusing lens.