I noticed that Neato learn much from Navibot. For the first, its cleaning pattern - first along the walls and then entire floor. Better cleaning effect, I guess. And it doesn't do torsional stiff movements (like Navibot does) - just a gentle curve. In these situation Navibot sometimes leaves some dust clumbs behind him, Neato shouldn't do that, I think.
past: Samsung SR8855/SR8895 (bad rotor) Neato XV-11/XV-15 Roomba 780 (bad battery) Scooba 385 Roomba 530 2x Scooba 230 (broken bladder; 1yr of use -> $300 dump to trash - not worth any $)
current: Roomba 620 (bad CHM; repaired u/warranty)