I have a Neato and although it doesn't "remember" the layout (I mean, layouts can change, things get moved etc) it usually only takes around 3-5 seconds for it

I have a Neato and although it doesn't "remember" the layout (I mean, layouts can change, things get moved etc) it usually only takes around 3-5 seconds for it to scan the room and then it's on its way. So I do not see it as an issue or inconvenience. Is the Roomba different in that respect? I remember seeing Roombas a couple of years ago and they were very 'dumb' compared to the Neato. Even the top-end model used a pretty basic wall following algorithm whereas the Neato uses laser to scan the room. Do the new, top-end, Roombas not also use a laser now?