I'll not have this Dell-slating. Nothing at all wrong with their laptops. Mine's been lugged around the world, dropped most of the way down an up escalator at JFK airport, and generally abused, and it's still going after three years with only a replaced keyboard.
My Dual Xeon of theirs, three and a half years old, is also still going. It struggles at DC stuff these days, but then it's using Prestonias (which were absolutely brand new at the time - I had to wait a month for them to make the hardware
).
So yes, for overclocking, you can slate them all you like, and up to a point, you can slate them for noise too, but for reliability, I don't think so. Also, try overclocking a Mac.
Oh, and my next laptop? Yup, it'll be a Dell, but I'm waiting for Merom first.