I did the same thing. Mine only took about a week to get here after he shipped it.
I installed it on Friday other than fighting the spring on the final installation step and stabbing myself with my needle nose pliers when it slipped, it was an easy install.
I LOVE it. I don't know why Beretta doesn't just put this in all their shotguns.
I always tried to keep my thumb at an angle, like TC recommends, for nearly 2 decades with my old Benelli M1s. But, without fail, it would still nip me on occasion.