The product itself is great. It works very well and saves me about 30 to 40 seconds of vulnerability and saves me about 100 ro 200 rounds a game. I had a small problem with the collar but i will describe that in a second.
When i recieved the collar it had no instruction book or anything to indicate how to get it on and ovcoarse i had many problems fitting it on. So i asked a paintball expert ( who has one and loves it ) and he said to drill a 1/4 inch drill bit through the hopper. I did this and after having to put the screw in several times i completed it.
I would say that once it is attached to the hopper it is the best of its kind. It's fairly inexpensive so thats a plus. But the difficulties i faced brought it down several points but i do recommend this product to anyone who reads this.