poor touchpad and sound drivers (i don't have any issues with these, others do)
noisey middle fan (only when it comes on, I don't have this problem but others do)
noisey cd drive when the cd is spinning, this is a flaw with a lot of laptops, but it's still a flaw
some really really crappy support from certain sager resellers, not all are bad, but PC Torque and Flawless should be avoided (
check out this list for info on all resellers)
just buy from a good reseller and you won't have any regrets