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The disc drives on the early slimes go out easily. Ive had the drive on three slims go out while playing legit retail discs (not modded or burned) and in near perfect condition.
The slim is allot quieter, if your console is near you watch the touch sensors or else it will kick you out of game when the disc trey opens. The extra usb ports and wifi is really nice.
the phat seems to have better built disc drives but are allot more likely to get the rrod (in general, not sure about jasper in particular)
Also by the way the reason the slims dont get the rrod is because the just changed it, when something goes bad it is a rdod (red dot of death) but that does happen less.