Do robotic vacuums work?

[CrazyDe1]

Specifically this one:

http://www.roombavac.com/buyroomba/default.asp

 

[Pepsi90919]

ROOMBA!

 

[Mr N8]

They seems to get stuck in corners a lot. Most people find them very cool in the beginning, but end up hating it withing a couple of weeks.

 

[dman]

Oh my god, it's Mega Maid. She's gone from suck to blow.

 

[DrPizza]

I've been considering one for dog hair, (3 dogs, lots of fine hair getting shed), (hardware floors)
Normal traffic of people walking through creates enough of a breeze though that 90% of the hair ends up behind things and in corners. The robot wouldn't reach it.