One of my favorite lenses are Tamron SP series, all members are exceptional. Tamron SP 60-300mm also an excellent lens it has comparable quality with many prime lenses. Very good performer indeed, sharpness and color rendering just great. I saw many sharpest prime lens, but I not saw many better zoom lenses.In my opinion this lens a very good traveler lens , because quality is pretty good and it has also a good multi purpose focal length range from portrait to long tele photo.
Bit long lens and sometimes not easy to get right focus, but a very usable lens. You can get if lucky dirt cheap on Ebay. Well built massive construction after many years just perform as well.
A good zoom, with a decent performance even at 300 mm and w/open. However, the "true" maximum aperture at the long end is around f/6. Visible vignetting w/open. Macro setting (1:1.5) is available only at 60mm, which is not suitable for shy subjects due to the very short working distance.