I get mine from the 2nd hand market since I have a need to fill the 18 - 49 mm gap. The price is good for at that time, it is about half the price of a EF17-35mm f/2.8 L USM and a quad of the new EF16-35mm f/2.8 L USM, which I cannot afford neither. The image quality and the built are good as expected.
Of course, when there is no USM, there are quite a few issues to cope with. Well, I find it is okay to me. Since the old EF17-35mm f/2.8 L USM, has dropped even further at the time of writing, may be the best logical choice if you cannot afford the new one.