Ok, I live in a house of mainly guys, and it's hard to get housework done.

I've heard of these things a bit, but I want to know if they are actually practical and will be able to vacuum the whole house.

Does anyone own one? Kinda wanting recommendations, and advice on what they can/cannot do.

At the moment I've been considering a couple off eBay:

Robotic vacuum (Aus)

iRobot Roomba (US)