I looooved this game when it came out. I somehow managed to beat it two or three times (not counting the times that I would get 1/3 or 1/2 way through the game but had my save file deleted -- stupid third party memory cards). The weird part is that I wasn't able to play video games on school days back then, when I was in high school, and I would spend a lot of time with friends on the weekends. Who knows how the hell I managed to sink so much time into that game.
When I was 18, I joined the military, and gave all of my PSX games to my friends. I bought a few of my favorites again over the next few years (mostly Greatest Hits games), and I've been buying some more on PSN recently. I tried to replay Xenogears last month... but the damn sewer part killed my momentum completely. Oddly enough, I absolutely LOVED the Kislev part back in the day. Probably because I was sick of the desert stuff and I love oppressive-feeling grungy sci-fi stuff.