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I have the prior version HKW-600, and it works reasonably well. There is moderate echo on the other end (none on my end - leading me to believe that it's not a BT interaction, rather a lack of software cancellation from the speakerphone). It worked really well with the phone book on my SE T-616, and I wsa able to see the entries in the phone book, for example. Works less well with my audiovox smt5600 in tems of accessing the phone book, but speech is passable. The thing does pick up ambient noise like you wouldn't believe, so no driving with the windows down, or even on the freeway.
Newer technology may improve things slightly.
O