I also have the Matrix guide series with the .019 pins (3 pins). I really like it, I think it's real durable and the smaller pins have made me a little more accurate (I think). Sometimes in low light conditions, the smaller pins are harder to see (not as bright) than the larger pins on my other sights. When I turn the light on, they are of course plenty bright. I wonder if I had gotten the larger pins if I would need the light at all... Great sight anyway.