I had the camera bag in the boot which was flat floored all the way to the bumper. Didn't realise that it was unzipped, pulled it to the rear bumper, lid flopped open, bag overbalanced, camera fell out, lens broke apart mid barrel, .......air was filled with EXTREMELY bad language !!!!
I needed to replace it fairly quickly but couldn't find another 18-135 in the timeframe. I tried the 18-70 and liked it very much, well worth the £300 odd that it cost. Very sharp through the whole range, no barrel creep and very well built. No VR on this model but I don't really need it up to 70mm.
....and I didn't consider the 16-85 only because it was out of my price range at the time. The VR would have been nice though.
If it 'ain't broken........ Don't try to mend it !