I used a Hindsite last year and changed it this year.
I liked not using a peep. I liked the way it lined up. I liked that it did not require me to have perfect form/head placement, which was great for hunting.
On the other hand, I always thought it was fragile. The rear site seemed very vulnerable to being hit and knocked off line (although it never happened to me). I thought the sighting method itself was counter-intuitive, as you would line up with the 20yd pin, then shoot with other pins for longer ranges (while still keeping the 20yrd lined up).
Overall, it was worth a try. I am not planning to use it again, but can see how some would like it.
I currently am using an AnchorSite, and am going to try the Z-Point. I don't think I will ever go back to a peep.