I have been tempted to switch to one of the mid 2009 umbp mainly because of the 7 hour battery. I know I will be essentially downgrading to a lower spec laptop but I really want the extended battery on the new models. I can only get about $1600CAD for my current machine and it will cost me around $1500CAD for the 2.26ghz mbp. Should I do this? or would you do this if you were in a situation similar to this?