I used to have the older version non PDZ one but sold it. It was good but very slow to auto focus. A very good all round lens though for image quality. The newer version is a lot smaller and the image quality is still supposed to be reasonably good, but it is still slow to auto focus.
It's a bit of a jack of all trades lens and at £370 new it is not cheap compared to the 55-250 at £175 and the 70-300 at £350 on Amazon. That is if you are using Canon
I don't think I would buy another one.