My experience with SLR/DSLR is limited to my 400D camera and twin lens kit i got with it. I spent what i could afford to and got the performance i paid for. Still i have used the web to gain information on how to get the best out of the lens's i have.
Also when dealing with warranty returns, its never straightforward. A warranty replacement is not usually given if the product is performing as per specs. While we may 'feel' its not good its not a sufficent to get a replacement on this. You need to make sure you dont come of sounding to the retailer as though it is a change of mind return. I have returned and had replaced many items from Shoes to computer parts, its a matter of approach. It is unfortunate but with some retailers you must be a little tac full in your approach. Might also help to take a friend who really understandts lens well and can explain the problems as problems.
You say
1. Focus is slows, retailer can argue this is a shortcomming of your body rather than the lens. Or this is the normal operation of this lens.
2. OS is slow again the can say its within spec. Or a result of the combination of the 450d body with this lens.
You need to quantify the problem and perhaps request the trial of another lesn in the shop to see if it perfrorms 'quantafiably' better.
Dont leave room for the retailer to think you are simply nit picking or have had a change of mind. Do you research see what others have said about the same lens and body combo and then present case to the retailer.
Working in IT i deal a lot with users who think the problem is with the box, even though you might replace everyithing in it. It is crtical to listen to what the user is saying and seperate the emotions from the facts. People no doubt get very frustrated when there peers and mangers are hounding them for work and there computer just wont cooperate with them. In such situations its very challengint to get the facts, so experiance and research help to seperate fact from fiction.
Often my friends call me first before they go to the shop for warranty repair on ther computers, just to ensure they present the facts to get what they need done. Similarly you need to do your homework, either by calling a friend who knows camera's or by reaching out to people on the forums first before approaching the retailer.
Might i also suggest perhaps you try the lens on a 40D or 50D camera and see if it operates diffrently, surely the place you purchased it from can at the lease permit you to do this test. As others have suggested it may perform better on a pro body.
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