I am not sure if this is the place to post this. I have two 40 something boys. One has an old Roomba that I gave him maybe 10 years ago-it long ago has died. He also has the Samsung Powerbot-not sure of the model of this one. He seems to like it. I would like to get my other son a robotic vacuum. I have read some talk here about different brands. For those who have studied this topic on here-what seems to be the best one? And, what would be a good deal price to buy it at? Thank you!!