I've never really used a laptop as a main machine before so it will take me some getting used to.
At the moment, I think Vista's bloat and the 5400rpm drive makes the system seem particularly slow at booting up. My Nan's HP notebook with only a Celeron and 512MB RAM boots up quicker for some reason. I wonder if the Ultimate edition (as opposed to her Home Basic) has tons more services to get going...
The glossy screen (TrueLife display) is a bit annoying in bright conditions. I find myself squinting through my own reflection to see what's on the screen. Much better in ambient lighting.
Some of the games I've tried don't work. The Lost Planet DX10 demo and BioShock demo (both off Steam) crash on start. Probably caused by Dell's own 8600M GT drivers. Played GTA: San Andreas and Dawn of War and both work lovely. Computer is probably best suited to playing games that are a couple of years old now.
I like the buttons on the front for controlling volume, playback, etc. Beats faffing about with the volume slider in Vista. The speakers actually are quite loud on the 100% setting. 20% is more amiable to my ears.
The machine is very quiet even with the fans going ten to the dozen. After a bit of gaming, you can feel the very warm air coming out of the vent on the side.
That's all I can think of for now.