Yeh i could be taking this one back, its not a great lens, i will see how well it does tomorrow but if its a poor performance then i will just stick to the kit lens a bit longer and get the 180mm F3.5L Macro USM.
as you can see the colours captured are nice but thats about it apart from the little bit of extra clarity, the IS is quite nice, especially since i use extension tubes and this darkens the images and thus making the IS come into play over slightly longer exposures when handheld, but i will see tomorrow, if not its going back monday morning.