I just put one on my bow. It's awesome not having to use a peep sight and makes my pins so much easier to see.
There are a lot of pros.
Here are a few things that concern me.
1) Rain or moisture fogging the unit up
2) It seems a bit delicate. They have an aluminum housing model, but the "lens" is still plastic.
3) It takes a while to actually get it sighted in. I posted on another thread to allow an hour.
4) You need to have your shooting form down, with a solid anchor point. Work on being able to draw, and anchor with your eyes closed and when you open them, you're very close to your natural anchor point.
5) One of the things they advertise is that it will show you when you torque your bow. i had a concern that if you torque it during setup, you'll torque always. So, make sure you have your bow placed correctly in your hand, during setup.
Ok, my common theme, allow patience during your setup.
I also placed mine above my sight housing, so I would be able to see under it. But that is personal preference.
One of the big things about the company is that I sent and asked a TON of email questions and someone name Lynn answered all of them. And quickly...
I'm interested to see what headhunter says.