There's an Eonon D5102 wiki here, with many Eonon reviews and other useful resources: http://d5102.wikispaces.com/ You can take a look.
And this is the latest review received from one of our customers:
About the radio function, yes it has FM/AM, and 30 Preset stations.
About the factory display, on the '06-'09 models the LCD will still show climate control info and light up.
To know how to install our Eonon unit, you can download the manual here in our website: http://www.eonon.com/manuals.aspx?txtSearch=d5102
Hope these info helps! Would you like to get an Eonon unit? A possible group buy will be arranged if enough people are interested in it! Cheers!