I had never heard of this game until I purchased a copy of Zone of Enders for the PS2.  And after doing some reading about the game on the internet and playing the Metal Gear Solid: Sons of Liberty demo, I decided to check out the PS1 Metal Gear game.  To simply put it, this game is the best game I have played to date.  I found this game to be much better than Oni for the PS2 in fact.  The puzzle and bosses on this game were very different and possessed depth of character.  Some parts of the game were frustrating particularly fighting Metal Gear Rex at the end of th game, also the torture scene was pretty hard too.  But I can't wait to see Metal Gear Solid: Sons of Liberty come out this year.  I know it will be one of the best and highest selling games of all time regardless of the videogame platform.  This is definitely an innovative and original game that sets new standards for others of this type.  Buy it and you will see what I am talking about.