I tried one in my good ol' 870 last year, and the Hevi13 patterns were very tight at 40 yards, but the Lead patterns were nothing special at 40. I ended up either trading or selling that RemChoke Star Dot. My Indian Creek .665 was shooting good at the time.
I picked up a new INV+ BPS this year, and I also picked up a Star Dot for it. It shoots tight patterns with Hevi13 at 40 yards. The Lead patterns at 30-35 yards are awesome, but I didn't try Lead at 40. I fully intend to keep this INV+ Star Dot, and I may not even try any other turkey chokes in my BPS.
I tried more than 10 turkey chokes in my 870, and I don't care to go down that road again with my BPS.