I racehipped my wife's 2008 T5 V50. Yes, you heard that right. Not sure why I did it exactly, but I did.
I am not sure that there is a real difference on the top end/peak torque, but there is a noticeable difference in the low end. (This is true for my impressions of racechip on my BMW 2011 550i as well). For what I paid, this is worth it for me, especially if their fuel efficiency claim is true. (I do see some improvement in fuel efficiency in my 550i).
My only gripe was that the install was far more involved than I expected. You must end up removing the bumper cover. You can't get at the connector from the top or the bottom. It took me about an hour to figure this out (racehip images show simple access for a Ford using the same engine, but Volvo has packed it differently) and then another hour to figure out how to remove and re-install the bumper cover.
I don't care if this reduce the block's life a bit (the thing has more than 150k miles on it, so whatever at this point); I doubt that it will given though this block is not particularly stressed stock.