I do would really like to know that make and if/how well the thing actually works. $250 is shockingly cheap compared to any iRobot product. If people are selling a $250 competitor that actually works, how on earth is iRobot even still in business?
About two or three years ago my old robot vacuum was finally dying and I did a lot of on and off searching for what was out there. When I started looking almost every competitor was better quality and features than what iRobot had, for around the same price, and they were just starting to play catch-up.
I don't know how much they've improved in the past year, though.