I bought this grip to go with my MK36 a few months ago and have used it in around 10 games. I haven't had a chance to try out the pressure pad housing yet but it's nice to have the option. Overall it's a decent grip for the price, but I would buy a different one if I had the chance. The word "ergonomic" really only applies if your hand is a certain size thought.. I have larger hands and I typically wear gloves when I play so I often find myself holding my gun by the magwell or even on the rails behind the grip, as it can be awkward to hold this grip in game.
One major gripe about this foregrip is the fact that it is an absolute pain to get it on any rail. I ended up having to shave some of the plastic off and even then it still requires some force to put on. I would recommend using some oil to get it moving.
~Material, it's a fairly solid grip
~Pressure pad housing options
~Looks fairly nice
~Major pain to install
~Height makes it a pain to fit in my gun case
~Very thick, not made for small hands
Final Thoughts: You get what you pay for, I would recommend spending a little more though and buying the Magpul PTS Vertical Grip. A friend of mine uses that grip and it is extraordinarily comfortable.