I've only had the lens about 6 months. I bought it from another reputable POTN user. It is in excellent shape, and works as new. The exterior of the lens is excellent condition with no visible marks or wear. The front and rear glass are un-marred: no scratches, nicks or dings. I use it on an 80D and it performs well.
I am selling it because I have decided that f/2.8 is not fast enough in this range. I am going back to using my 28 1.8, 35IS, and 50 STM when I need aperture. I have the (most excellent) 18-135 USM for when I need a zoom.
Sale includes: lens, both Tamron caps, Tamron hood. No box or papers. I am asking (now $150), shipped and paypal'd to CONUS. Will ship to Canada for actual postage cost. I have very good feedback on POTN as a buyer/seller, and the same on E-Bay (PM for username). PM is best contact.