I bought this gun attachment specifically to use with Killzone 3. After a few goes of playing, I had no idea what I was doing and ended up getting killed left, right and centre! However, after contemplating throwing the gun at my TV (!), I decided that I would keep trying and I am pleased I did. After about 3 hours of learning, I am now comfortable with the gun and would recommend it to anyone.
To be honest, if you are obsessed with you Kill/Death Ratio, then you might be better suited to using a joypad, but if you think that fun/enjoyment is the most important part of a game, then you need to buy this, without a doubt.
Looking forward to using this on future releases...