From a purely personal point of view, I prefer the kind of approach Stevie D suggests. Several sites I use display light boxes; one of these closes automatically after ten (I think) seconds, or it can be closed manually. Other sites use a sidebar to show the contents of the basket without taking you away from the page you are on.
Bottom line - I prefer not to be taken to the basket.
Ask your friends, family, colleagues - anybody you know who shops online, however infrequently. It won't be scientific, but it will give you a rough idea of the views of real people.