OK, another Dell vote. 2/10.
Background info: About a year ago, I ran an old IBM Thinkpad 560x. It was a P233MMX, originally built for Japan (Kana AND English on the keyboard! Really l33t-looking.), and found by me on eBay for $100, no OS. It ran, but it was on it's last legs and held together with duct tape. My parents were worried about me losing all my schoolwork and not being able to write papers etc. if it died. So my dad decided to get me a new laptop. One caveat: It had to be a Dell, because his employer has a deal with them, and we would get a $200 discount. Anyway, I got an Inspiron 600m.
It ran, mostly. After I cleaned out all the junk that OEMs like to smear all over their systems (For the last time, I DON'T want a free trial of AOHell!!), I got down to using it. It was a different typing experience than my old Thinkpad. The keys were bigger, but they felt insubstantial and mushy. Then I tried actually putting a load on the system.
Here's where I found some problems. The fan on mine was in a corner (right under the "`" key, above tab). There was a hole in the bottome for sucking air in, and a hole at the back for blowing it out. In between was the fan and fins on heatpipes. The fan had a nasty tendency to suck air in from the intake, and then blow about a third of it back out the edge of the same hole. I fixed that by jamming some index card inside the thing, next to the offending part of the vent. And it did indeed increase airflow over the fins.
Another problem then came up. The chipset and the GPU (An R9000) are cooled by the same heatpipe. The GPU chip and RAM were in one compact square. (it looked like the GPU was cross-shaped with four RAM chips in the corners). Anyway, the about a fourth of the square had no contact with the heatpipe. I could tell it was overheating, too. I got artifacts even in relatively low-stress games. (think "Age of Empires 2") So I had to break a copper fin off of an old desktop heatsink, and glue it to the heatpipe with ASA to get full contact and stop the artifacting.
I didn't particularly like having to mod the system just to make it work, but it did now, and for a time, all was good. Then, one day, I tried to use the floppy drive that came with it. It couldn't read anything. I tried a bunch of disks, nothing. Then one disk just wouldn't eject. I wiggled it out with needlenose pliers and through it away. Thinking it was a bum disk, I tried another. The drive ate that one too. By now, IIRC, windosws couldn't even see the disk drive. Toast.
Then we have the A/C adapter. There's a little LED on it that glows green when the adapter is plugged in and capable of supplying juice. One day I plugged it in. No light. I jiggled it a bit, and the light came on. I thought it was a fluge, maybe I hdn't plugged it in tight enough, or something like that. Anyway. over the weeks, this became a very frequent occurence. To make it more time consuming, the adapter would often decide to light up for a split second (bringing the LED to full brightness), and then die, which I wouldn't know for another five seconds as the LED faded. One day, it just stopped lighting up at all. I had had a similar problem on another laptop. There, one of the wires was looslely connected, and reseating it with a bit of help from a soldering iron solved the problem. So, since it was dead now anyway, I broke open the PA12 adapter. Nothing loose that I could see. Anyway, after a few electrical shoks, I got it running again. Then, a few days later, it died for good.
Did it run? Yes. But I went through a whole lot to make it run and keep it running. I would count it out on cooling problems alone. My mom's owned two Dell desktops, both have run into severe problems due to overheating, and my laptop was no different. This was the last straw: I'm never buying anything from Dell again. Ever.
Oh, BTW: That IBM Thinkpad 560x it still going strong. The batteries are shot and the headphone jack dosen't hold a plug well because it's chipped, but it's showing no signs of dying. They don't make 'em like that anymore...