One of the best reasons for using linux is to bring out of date computers back to life. Linux will run very well on older machines.
This is a good use for linux
I have fluxbox on my old laptop and it's running sweet.
Also the reason why so many use it on netbooks.
On modern enthusiast machines (ie i7 with an ssd) windows 7 runs much much faster. This is from my experience, sorry if it offends anyone.
100% disagree
My linux uses 180-200mb of RAM at desktop with loads of stuff running
My Windows7 uses 1GB of RAM on boot
My linux install is more responsive, loads quicker and runs a lot quicker than my windows7 install
I think people must be using bloated installs of linux or something
I know I don't have an enthusiast machine with a SSD but would guess comparing windows7 and linux would be similar even on an enthusiast machine.
I use linux because:
it's free
it's customisable
it is always evolving
it's quicker than windows
it has some amazing free apps
I recently installed mint fluxbox on my laptop as windows was unstable on it and it took me about 30mins (slow laptop) to install it and get it all running with wireless drivers and everything. (I did then spend another 30mins removing a lot of the bloat but it was all working in 30mins)