I've been using this lens about six years. In all that time, I can't remember ever shooting at any aperture smaller than f/5.6. It's amazingly sharp wide open and I've never had any reason to stop it down. When I first bought it, I used it on a tripod almost all the time. These days, I've started using it handheld and I can appreciate how well it handles. In good light, autofocus is fast and accurate. In low brightness and low contrast light, it gets a little slow and sometimes hunts. Not a real problem, just switch off the autofocus and use the superb manual focus ring. Images snap in and out of focus easily whether you do the focusing or you let the lens do it.
The lens is made like a tank. Mine has been subjected to a lot of use but it has never failed me. I sometimes use it with the Canon 1.4x Extender which makes it a 560mm f/8 lens. That combination does usually require a tripod but it is still a handy combination that retains great sharpness. I've also used it with the Canon 2x Extender as an 800mm f/11. It's a good idea to put it on a sturdy tripod and stop down a wee bit to get the best results.
If you can make use of the focal length and you can live with f/5.6 as the maximum aperture, I recommend it highly.
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