Not as good - Shield Arms S15 Gen 3 Combo Glock 43X/48 15 Round 9mm Luger Pistol Magazine

Bottom line review goes as this: Would I buy the Shield mags again? NO.
Cons: They don't seat in the pistol as firmly/snappy as stock
I had multiple jams with FMJ ammo which could be from the ammo.
Pros: Nice to have 15 rounds
I fired approximately 150 FMJ rounds and no self defence rounds at the range and had four jams.
So the Shield mags and steel mag release button will sit in a supply drawer till needed and I purchased two more stock mags.
If I need a higher capacity of rounds I will simply carry a G26.