just received mine yesterday when it got delivered to my place since i won an ebay auction for it at a very good rate.
Don't expect it to be sharp like the 17-50,
its an all rounder lens, focus is pretty decent during daylight, focuses pretty bad when its dark
don't expect to zoom this at 200mm when its dark handheld though.
overall a decent lens if you just want something that covers that wide of a range for a cheap price
but if you have the budget and want something that covers a wide range
i'd recommend the 18-270 VC instead. you'll benefit from the VC.
don't really necessarily have to get the PZD version which cost more