I must admit, before buying something online I generally research beyond what is considered normal. There are literally thousands of choices of magnetic mobile phone holders. Read enough reviews and your choices for solid built, strong magnetic holders turns into fewer than 50. Tackform stood out because of price, simplicity, customer reviews, and US based company and customer service. The product works!!!! Adhesive sticks, magnet holds. Product form is not intrusive and blends into dash well. Have tried with three different phone cases by simply placing the thin metal plates in between phone and case, and phone holds perfectly and hasn't come close to falling off. Honestly, I'll give this a six out of five star review. Oh yeah, I will be ordering two more for my daughters' cars. My suggestion to you, just buy it!!!