Not cheap, but for me, worth the $...
I purchased this used, but remarkably clean example for $376.00, Dec. 2018.
I was looking for something w/extended range to rival the Canon 24-105mm L lens as an all-purpose walk-around lens to fill a whole in my inventory for an older, but minty, Canon 1DS MKII.. (I also use a more modern Canon 80D).
I have the 2nd gen. Tamron 70-200mm f/2.8 (A009?, you'll need a crane & truss for use w/the 1DS MKII), Tamron 100-400mm (nice, lightweight, long lens) and a Canon 70-200mm f/4 (always great).
This Tamron 28-300mm 3.5-6.3 PZD Di VC for Canon does the job admirably and is remarkably smaller & weighs less than the venerable 24-105mm, too..!!
Sharpness, color, contrast are in there at all apertures..
What is also pleasantly surprising is it's accurate, fast, low light auto focus ability, something I didn't expect..
Rev. Dustin Abbot reviewed this lens positively, accurately and enthusiastically. His review convinced me to find one.. (I ALWAYS check with Rev. Abbott & Christopher Frost to see if they have a review).
This PZD version isn't cheap, but after trying the less expensive (junk), disappointing and horrendously unusable earlier LD version (I was trying to save $), I must say that I am now a Happy Camper.
When I upgrade to a newer full frame camera, this lens will remain in my inventory.
It's a lot of fine glass for the $.
Verified purchase: YesCondition: Pre-owned