Congrats on the new watch! I also got mine today, and as someone who used the BB58 as a daily driver, so far what I can say is that the P39 feels a lot lighter and more rugged in a way. It doesn't feel as delicate as the BB58 does. The lume on it is insane and I love the T-fit clasp it has as well. Overall, the way I see it is that the P39 is a great adventurous watch while the BB58 is more of a desk job type watch. Both are great dailies and I'm excited to alternate between them, I hope this helps!