I have a slim and encountered a bug playing Dragon Age that was specific to the slim. I played FO3 on an old 20GB Pro model and did not encounter the same number of issues I'm having with FNV on the new 360. I think most of the problems are due to Obsidian adding too many bells and whistles and not having the same level of understanding of the game engine. The first patch came out so quickly they must have been working on it prior to release. I suspect all the contractual obligations for pre-sales, advetising, etc. forced them to push this out the door unfinished.