I love this too! I was using Blot Powder but it's not mattifying enough for me during the summer months. I tried P&P transparent finishing powder yesterday and I didn't need to apply powder again until evening. I did blot once at work but that's nothing for me. I usually need to blot and/or apply more powder by the time I get to the office (perhaps 90 minutes after my makeup goes on). LOVE this product.
I'm also using the mineralized concealer but I think I need a different option for days when my dark circles really are bad. I like the concealer for an everyday light use but something with more staying power would be great. I like the natural dewy finish of this one though and am not keen to switch to something cakier.