In terms of heat: I bought it off of Ebay and, when I received it, the fan
wasn't working - the laptop kept cutting out when the cpu got too hot. So, I
installed a new fan and now it seems to be running fine. My wife has a
Macbook Pro running OS X and it doesn't seem significantly hotter or louder
than that. Wow - the measures that other user took sound pretty extreme! :)
I had to modify the xorg.conf to increase the trackpad sensitivity. But now
I've done that and sorted out the swap, it's running really well.
Another thing to mention is that initially I couldn't get any of the Trisquel
ISOs to boot from disc with the Apple firmware. So, I installed Lubuntu first
(using their amd64+mac ISO), then flashed the bios, then installed Trisquel.