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I've read that they are great. One of the threads that Lexmus posted is one that I started in November of last year. I decided to go cheap and get a tape deck adapter (ION brand) with blue tooth only but the battery wouldn't recharge. I wish I would have purchased the GROM instead. The only reason why I didn't go back and get the GROM is because I decided that I am going to get a newer vehicle in August or September.
Even though I myself haven't used the GROM I would recommend it over the cheap adapters that I got.