Been frustrated with my stud sensor lately. (Yeah, I know)....even though it's a decent zircon i65 it's been intermittent and causing me to waste valuable time. We all know all sensors have good point and drawbacks whether it's electronic or magnetic. I just wanted something that would work if I don't ask too much of it, just show me stud locations quickly and we're good. So I found this and ordered one. It came today and I tried in my home and it's pretty awesome. I have yet to try on plaster walls or anything else. Not that this or any sensor would work with a wall I encountered this week that was actually 5/8" plywood under the drywall across the entire wall. Thank god I just bought that new Makita multi-tool!