I just got a new MBP 15' 2.4ghz i7 and it has 4gb of ram. I am looking to upgrade it to at least 8gb. I have seen Crucial memory but I'm not sure how good their products are. They have a 8gb kit for only $45, that seems to me to be very cheap for 8gb considering that apple charges like 200 for that upgrade. Has anyone used crucial products before?