Things I liked: Great for the price, it served well on my titan and now on my marauder.
Things I would have changed: I really hate the positioning of the illuminator. It shines directly into the window of every single red dot scope I've used, completely blinding me. I fixed the problem by putting a short hollow tube (the body of an old mini flashlight) over the light so that it sticks out past the reflex/red dot sight and it works perfectly.
What others should know: You will be blinded if you mount this in front of a red dot without the above mod or something similar. Your sight will need to be shielded from the illuminator. I took it a step further and hooked up a focusable 800mW IR laser to it, much brighter/farther and doesn't get in the glass of your sight.