I am one of the few who is using REW to tune my entire system. While many think that the ideal system is one with a flat response, we all know that it in fact sounds pretty bad when listening to it. I think it'd be pretty cool be able to do a hearing test (say with a set of headphones that's been calibrated by REW) so we can tune our systems to OUR ears. For the time being, I think I'm going to get a hearing test and try to import the data into REW. Wish me luck!