This was bought as a landscape lens to be used on a Nikon D200. I also looked at a Tokina 11-16 and Sigma 10-20. The 8-16 won out on colour and sharpness. Despite reading all the favourable reports I didn't like the Tokina that much. The Sigma 10-20 was OK.
The AF on the 8-16 is fast and accurate, (despite what Ken Rockwell says in his review of the lens) and the build quality is very good. It is just a very easy lens to use. During the purchasing phase I took some test shots at 1/10th, F5.6, ISO 100 handheld indoors and got more than acceptable results. The level of distortion considering how wide this lens goes, is excellent.
I agree with the previous reviewer, Sigma have kicked a goal with this lens.
The only detraction so far is the very exposed front element. One has to take a little more care than usual.