I've had my X6000 for coming on 2yrs now. And the main problem with them is that they get HOT.
About a year ago, a couple of chips under my touch pad actually burnt out (burning smell, then dead) - needed a new motherboard in the end.
If you get a CPU tempurature monitor (I use Notebook Harware Control) you can get some idea what the temps are like inside the machine.
Don't have your laptop on carpet, bed etc. Needs ventilation underneath. I've even got a couple of lengths of wood on my desk to increase the air gap. When playing graphics intense games, I even point a desk fan under there. Might be overkill, but I'm paranoid now.
Buy a aerosol spray from your local computer supply shop that sprays clean air - regularly make sure the fans and the vents are cleaned out. Amazing how much this helps.
Basically, the X6000 is a desktop squeezed into a laptop case. I'm willing to live with the heat problem until I'm ready to upgrade to something more powerful, and cooler!