I bought another as a gift and this fir myself, It's a decent size and weight but not what I expected control wise.  I thought you would turn in on set it in a corner then vacuum debris into it an any time.  However, you have to actually turn it on to a sensor mode (fine, makes more sense not even sure why I thought I wanted something on all the time) but it doesnt actually seem to sensor the broom because it just turns off in the middle as if its timed instead (if that makes sense).  I dont know, its useful but not perfect.