I can now answer the question myself, as I bought the case. The MagSafe functionality seems to be completely identical to other cases such as those from Apple. This means that not only do MagSafe accessories such as a wallet hold perfectly, but a MagSafe charger also works perfectly (the mobile even "sticks" to it as usual).
I don't understand what you mean by Qi, but it doesn't prevent charging on my two types of induction chargers (wireless and non-Apple) that I have at home and at the office.
I hope my answer helps you make your choice.