I have used these for the last 18months and aeros for several years before, personal opinion:
Pros - cost (although minimal), protection is better, not as bulky, small holdhall/bag for them.
Cons - definitely move around more and slide down, can't remove padding and wash unlike aeros.
Would I buy them again? Absolutely, everyone asks what they are because they aren't aeros and they are blue 😂😂 so if your a kit badger and don't want to fork out an arm and a leg for remfrys etc then they are perfect...but in reality there's little difference to aeros.