
I found the 150 and tripod excellent and got nice shots I was really happy with but I've started using the 105 handheld again as I'm finding that I can with patience often get near enough anyway and its a lot easier to get the right angles although I'm often at ISO 800 this is not a problem with the 40D.
I also found that a little bit of the extra reach of the 150 is negated by having to mount it on the tripod mount on the lens as it was not so stable mounted on the camera base
I guess its down to personal preference what do you guys think

Pete