Hands Free Cellular on my 1995 Corolla!! (Almost)

I have been using my Blackberry 8820 as an MP3 player, but it is not convenient while driving as the ear bud keeps falling off and answering a phone call involves a lot of fumbling (by me) and cursing (by the other drivers). With an hour's drive to work one way I was desperate for a solution when I came across this audio adapter from Seido, after I had unsuccessfully tried all kinds of adapters from Radio Shack. I ordered it online and made a major mistake.
I had no problems with the online retailer, but I set it up to be delivered on Feb 14th to my house. My wife received the package got excited, saw the contents and flung the package into the trash can. My wife reported this a couple of days later, after I accumulated a few credits.
I did not want to digress, but even if one person reads this and avoids this tragedy, it will be worth it.
I tried the audio adapter with my home theater system and it sounded good (let me warn you that I am not an audiophile), a much better experience than the generic adapters I bought from radio shack.
The real test was when I plugged the audio adapter into my old and trusted my car cassette adapter. I was able to hear pod casts clearly. 30 minutes into my drive, when my wife, as usual called in to describe my 18 month old angel's current playful (in my view only) activities, I was able to press the mic button and hear her loud and clear on my car stereo and talk to her hands and wire free. She seemed to hear an intermittent echo, but overall it worked OK.
I need to test it further to see this usage is practical.

Update:
I switched to using a FM transmitter included with my car charger as the cassette adapter started crackling when exposed to sub-zero conditions. Regarding taking a call, Not everyone (my wife included) likes the echo. It works without a problem with the headset.