It sounds to me like you already have picked this up but that M+S designation is kind of 'generously' applied in my opinion. At best it's relative. They will be

It sounds to me like you already have picked this up but that M+S designation is kind of 'generously' applied in my opinion. At best it's relative. They will be better than a tire designed for dry pavement performance. But still range widely to how they perform compared to actual mud or snow tires.