I use it with the 13 Pro Max with the magnet quite close to the charging port so that it does not interfere when I charge it wirelessly. Overall, the magnets are quite strong and for the weight of the phone, 225g, it holds it steady and does not fall in potholes, etc. The stability of the wing that the base will catch plays a big role in how stable it is and whether it will move.

It is worth it for the money, especially if you don't have to think about wireless charging. If the magnet is placed in the center of the phone, it surpasses in stability and other types of bases with clamps