I know the specs, but I don't know if they make a difference in 'real world' experience. new-10 hrs battery life, old-7 hours. Real world experiences? new-4GB, old 2GB DDR3 memory. I have heard most MBP run just fine on 2GB. new-250GB HD, old 160GB (between my wife and I, we share a Windows Vista laptop and use 111GB combined, so the smaller drive may be enough). new 2.4GHz, old 2.26GHz (I have already read that this makes little difference) new 330M graphics, old 9400M (48 processes instead of 19?) screen- I have read that the 'new' screen is much better than the old. price-new $1199-$100 discount=$1099, old-refurb from Apple $929 bottom line-is the new one $170 better? I'm a PC guy considering the switch.