There really isnt anything I do not like about my system. It is taking some getting used to because the camera performance is very different from the Sony Z1U I shot with for over two years. The low light performance, color, white balance, etc, is all different and takes some getting used to. I ABSOLUTELY love the P2 system. It has been such a joy to edit with. Popping the card into a Duel Adapter and into my Macbook is extremely simple.
Ive shot HD for almost 3 years (all on tape) and have hardly edited anything. The P2 system is so much easier to use in post.
I am shooting the Gates housing, with the Fathom SWP port, and Green Force lights, also the new EM43 High Resolution monitor. The system is negative, however with the addition of Ultralight double buoyancy arms, and a small block of foam, its very slight (which is what I like). The Fathom port is a MUST have for any serious shooter. Full zoom through capabilities are amazing! You can shoot a whale shark and a nudibranch in a matter of seconds just by zooming in (or out)!!.
Let me know if you have any specific questions