I have never heard of that eonon before and now I know why. Sadly I bet money its built along side a Pioneer or something.
Speaking of which, I have use some of the pioneer BT units (DVD, touchscreen) they work pretty well too. I highly suggest getting something designed in the last 1 year or 2 at most. Not getting a bargain basement clearance unit. If you are going for BT comparability, simply because there have been changes to the BT functionality over the last 2 years.
Like I said before I liked the JVC approach because they rig it so you can remove the BT module when you want to. And the rear USB port kicks azz.