Well, as a die hard Blitz fan I decided to use P21S on the bimmer this last weekend.
First impressions - I wasn't too impressed - call me crazy but it seemed to get deeper after a couple of hours or it was my imagination
.
Application: P21S was easy on and off as is Blitz.
Pro in the fact it doesn't stain my black trim as Blitz may so I didn't have to be as careful around the molding.
Results: I think Blitz has better depth whereas the P21S seemed to be more reflective and wet looking.
One major bonus after a couple of days is that it doesn't seem to attract dust like Blitz does.
I don't have much of a preference either way right now.
Both are excellent waxes!
First impressions - I wasn't too impressed - call me crazy but it seemed to get deeper after a couple of hours or it was my imagination

Application: P21S was easy on and off as is Blitz.
Pro in the fact it doesn't stain my black trim as Blitz may so I didn't have to be as careful around the molding.
Results: I think Blitz has better depth whereas the P21S seemed to be more reflective and wet looking.
One major bonus after a couple of days is that it doesn't seem to attract dust like Blitz does.
I don't have much of a preference either way right now.
Both are excellent waxes!