You know those action movies where they're using suction cups to climb plate glass skyscrapers?Yea, this thing has just about enough power for that. I put it on my shower wall as a test and lifted myself up.Cons: I'm not seeing any, though I'll definitely let you know in the future if the magic arm goes wonky like many others have on me in the past.Pros: ULTRA SUCTION. I am about 70 kilograms on a good day. This thing held me for five seconds then I had to let myself down because I couldn't hold myself up like that any longer. Couple of attachments for other camera mounts or your phone, magic arm for swing-mounting and custom positioning, and some stuff for maintenance rounds out the overall package, along with manual and warranty card. As long as this can get a decent seal, it will grip and hold. The white safety line lets you know if your pump seal is getting weak so you know to give it a few more pumps to redo the seal. Breaking the seal is very easy even though it can hold a lot of force.Definitely a good product. I'm gonna try using this for a dashcam mount in my car, if the textured dash isn't too textured!