I bought this lens well aware of the mixed reviews-on balance they were good,but if there was one consistent criticism,it was sharpness,or lack of.
From about 5 months use now I would say I am very happy with it.In most circumstances it is sharp enough for my purposes.It is undoubtedly best at middle apertures,but contrary to some reports I have seen f2.8 is very usable,though less sharp than when smaller apertures are used.
It is very solidly built but not too heavy,a noticeable improvement on the kit lens.It feels right in your hand the zoom ring is firm but not too tight and rotates smoothly.There is no zoom creep when being carried around,this sounds like a small point but it is more important than some may realise in terms of carrying comfort.The HSM focusing is fast and near silent.It just feels like a quality lens.No,it is not a true Macro lens but its good enough for me-that said if you want a lens primarily for Macro photography you might want to look elsewhere.
Looking at it in the round and bearing in mind its very reasonable price compared to ,say, the Canon 15-85 standard zoom it really is a first rate piece of kit and I highly recommend it.