I was thinking about getting a Nikon pro wide lens... But there's no way I can afford over $1000 for a lens. Then I got a 24mm prime lens and it wasn't as sharp or as much contrast as I anticipated so I returned it.
With the some amount of money, I purchased this Tamron lens and it was a surprise. Despite of number of negative reviews on this site, I figured it worth a shot trying. That's because I see most negative reviews are from Canon users.
I got a used one but in excellent condition, almost brand new. It is well built and zoom ring is smooth with a little oily resistance which is a plus.
This lens is made with plastic and it's light but it doesn't feel like a cheap plastic toy. The image is little soft on wide open but it gives great contrast and sharp images at f/5.6 and smaller.
Softness at wide open is not a problem at all for me since I use this lens mainly for portrait with some landscape. I mean I stopped down the aperture for landscape anyway, so who care if it's soft on wide aperture when I do portrait? (hm... now it seems like they make it this way intentionally!?)
Just a fraction of what a Nikon pro lens would cost, I can take that little softness. Now this lens is constantly on my camera and until I can afford a f/2.8 Nikon, this would be my primary lens for a while.
If you need a wide angle lens with a budget, get this lens!