FINALLY finished Demon's Souls.
Had the game for a year. 46 hours play time.
Awesome experience.
I haven't platinum'd any of my games so far - haven't really been into finding all the treasures for Uncharted2 or anything similar. For me beating a game on the hardest setting is enough.
I dunno if I'm going to try it for DS, but I'm a little tempted. There is still Old King Doran's soul that I have to get.. Also, I have to find all the rings, learn all the spells/miracles and max out weapons etc. etc.