I had one years ago, back in my film days. It was a decent lens, I don't remember anything bad about it. When I went digital, I sold it and bought the 17-35mm. There's a noticeable difference between those two, especially where colour and contrast are concerned.
Having owned both, If I was in the situation now, I would buy a used 17-35mm over a new 18-35mm, any day, and every day.