I bought this is anticipation of my Samsung Galaxy Note 8 arriving 9/4/17. Obviously a large sized and heavy phone. I tested it with my work phone (I'm a veterinarian who does house/farm calls at least two days a week so GPS navigation/Google Maps, invoicing, etc all done on the phone). The phone is an older large android phone in an enormous, bulky, and heavy otterbox 2 piece case. The work vehicle is a late model Honda Element. We have broken about 4 car mount phone holders in the past month, the other two barely fit the width of the phone in the case and the phone would unexpectedly explode out of the clips at us. I placed the rectangular magnetic sticker on the inside of the outer portion of the case. I mounted the mount on the air vent with ease. It feels extremely sturdy. The swivel and customization ability of the mount is great but it helps that you can use the screw portion to tighten it down into position as well. It worked FABULOUSLY. Despite crappy PA roads, bumps, jerks, etc the phone never wobbled or wavered. The magnet is very strong, I attached the work phone while still in the office and violently swung and stabbed in up and down in the air and the phone never came off. This is so much easier to deal with then mounts that you need to two-handedly insert and remove the phone from. I know this will work amazing on the Note 8 and will post photos and a follow up shortly.It's unobtrusive and well designed. The rubbery attachment you wedge onto the vent slats is very secure. The only issue I ran into in my car ('97 Volvo 850), is that the vertical adjustment of the vents are very loose so when you put any phone on the mount, the vent is pulled downward until the disc portion of the vent mount comes in contact with the surface below the vent. This only impacts/limits the angle of swivel but to try to negate this I removed the mount from the center of the vent and put it all the way on the lowest slat I could to start.I know some reviewers have found there are bad/weak magnets used in this model occasionally, I am thankful I got a properly working strong one. At least 4 of my coworkers will be purchasing this same product after seeing it in use so I hope to be able to report on the % of any defective magnets shortly. I will buy again and I have already purchased the extra sets of magnet plates/stickers so that I can have one on every case.This product came with two large rectangle magnets and two protective layer stickers. Again, one was placed on the inside of the outer layer of an otterbox case, it stuck very well, I did not use a protective strip as it was going to be between hard case and rubber case. The second magnet I placed directly on the back of my old/battered Note 3 that came out of retirement when my Note 7 was disconnected, doesn't have a case on it, and just needs to survive 4 more days. As the back of the Note 3 is textured fake leather, I was curious to see how the adhesive worked. It stuck very very well and does not want to come off.While I will be getting a wireless charger for the Note 8 I have not tested wireless charging function impairment personally yet. Spigen warns that it will at least be slowed/hampered if not entirely prevented. I don't forsee this being a big issue for me, however, as I plan on installing a tempered glass screen protector on the Note 8, If the taking on/off of cases negatively affects the stick and function of the screen protector, that would be a downside for me.Overall, I LOVE this product, I will NEVER use dash mount, clipping, two-handed type car mounts ever again and this is a very useful and sturdy product I would recommend to anyone.9/4/17: I've added pictures and also want to add that after using it for 4 days it is occasionally pulling off the vent when I pull my phone off. Like other's have mentioned this is more likely to happen when you have a lighter/uncased phone (I am temporarily using a naked old note 3 with no case and magnet directly on the back of the phone). It's not a huge deal, you can slide it off to mostly prevent this issue. I still recommend this product over the clip kind any day!