iRobot CEO Colin Angle gave an extensive interview to GetRobo.com where he praises Neato Robotics as a company and calls their laser rangefinder interesting, but ultimately dismisses the Neato XV-11 robotic vacuum, saying that it does not do as good of a job of cleaning as Roomba, because it treats such things as couch skirts as walls and doesn't then clean under the couch.
Angle also said that the company is prepared to vigorously defend its intellectual property when warranted, but tends to wait to see if a product gets any traction in the marketplace before doing that. But, my interpretation of his Neato comments, where he expressed hope that their next vacuum would do better, suggests to me they are not a likely target. But who knows. (Litigation is expensive for smallish companies like iRobot).