Need an opinion on which is better to connecting my Ipod........

I'm considering an after market device. PXA07 which I think is made by Connex2Cars. and the other device i'm thinking about is the Sony XA110IP which you would think would work well but I read a review that made it sound limited in what functions you have control of.

So i'm wondering who and if any one has used either products and tell me your likes and dislikes. I figure that there about the same price I might as well get your opinion so that I don't have to buy one and return it to get the other.

I'll be installing it on a CDXM8815x.