the interface is a "tad slow" on the pioneers, but whatever. you'll just have to deal with it. i don't see it being a deciding factor on what HU to use or purchase. at least for me.
Some are some are not. Depends what iPod you are running. I have heard the Nano's zip right through on your interface, which I have. Just waiting till the weather warms up to install my adaptor.
To the OP, I am just using a 3.5mm to 2.5mm cable, plugs right in and works just fine. Also my 880 I would take over any other deck around.