In general, I used the P073 product on its own and also as a Klasse topper and got final results rivaling or perhaps even exceeding Souveran or P21S. I'm not sure why I lost interest in the product (could be that I tried to order some and the order got messed up), but I didn't think it was too durable. Also, I was getting significant amounts of dust build up. And I just find the P21S/S100 easier to use as a topper--and I don't trust the durability of P073 enough to use it by itself.
Are you still using it as your main wax?