It had overheating issues if your cat sat on top of it, with the side effect of cat fur being sucked into it.

Reference: http://akibjorklund.com/2008/the-cubes-fatal-flaw-cats

Yeah, I can imagine cats loved them. My brother's cat use to lay down on his laptop. While he is working.

the cube also didn't have a fan, it just used a chimney effect. And no I never heard of an overheat problem, I still have my cube--13 years, and it still runs fine (slow these days though...)

No.