Had the 70-300 APO as well till it broke (2 months out of waranty :mad:).

It is an excellent lense, but only for good weather. Also, while technically it is a 70-300 you’d be wise to use it in the 70-250 range only, above 250 the quality deteriorates rapidly.

From time to time the auto-focus can be a bit slow, hunting for the target. However, for a lense in this pricerange it is one of the best ones available. In my opinion better then the similar lense from Canon.

As mentioned mine broke just after waranty expired. Might just be a case of bad luck, but I would go for extended waranty nonetheless. It might be cheap where lenses go, but that still makes it a lot of money!