Bluetooth adapter for iPod Classic

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Has anyone tried using a bluetooth adapter with their Classic? Does it work well? If so, can you tell me what adapter you recommend?

Many thanks!
I have the Anker one and it works great. Transmits and receives, so it can be used for other purposes as well. Link below. Very reasonably priced too.

Link: http://www.ianker.com/product/99ANRECV-02BA
I'd like to see something with an iPod dock connector for older iPods. There's a lot of old info out there, but hard to find anything outside of eBay.

Does anyone have a recommendation for dock connector bluetooth?