I was going to buy one of these and do a charging test on my iPhone 11 Pro Max - charge via my 18W USB-C charger with the Lightning cable and then charge with the Magsafe connected to the same USB-C 18W adapter and see the charging time difference between both. However it appears when not using an iPhone 12, the power output for QI charging is 7.5W instead of 12W which would explain the longer charge time. I suppose the question remains whether the 7.5W output is by design or an issue. Maybe like AirPower they had heat-related issues when output power is higher.