I still have my Tamron 17-50 2.8.
after about 8 years of use, medyo nag higpit yung zooming mechanism nya. It still works though pero kailangan na ng konting force para mag-zoom out or zoom in.
Ginagamit ko pa rin sya ngayon. Kapag tuluyan na syang nasira, I will still buy another tammy 17-50 2.8 rather than the canon equivalent.