It’s a no-brainer: Buy it, you won’t regret. That’s what I experienced when switching from the kit lens to a Tamron 17-50 2.8 (today, I’d also take the Sigma due to some flaws in the Tamron). What really makes the difference is the wider aperture. Nowadays, I often prefer the manual Samyang 35 1.4 over the Tamron because of its stunning results, but it’s not so flexible, of course.