The music essentials kit ($30) is usless with macs, so don't buy it. But you can use bluetooth for LG phones. I have the LG VX8300 for Verizon and I can sync my contacts and other things.
Go to set up bluetooth device and select mobile phone. Make sure in the bluetooth preferences for your computer, it says discoverable. Next, on your phone, go to bluetooth--> settings-->discovery mode. The computer should find your phone and you can click on it. You'll have to enter the passkey that shows up on your computer into the phone and from then on you can get your contacts.
From there, you can send computer contacts to the phone by selecting "send file" under bluetooth. Select the address card you want to send, then select your phone, and it will send it. You can only send one card at a time. If you want to send phone contacts your your computer, go to bluetooth in your phone, select the paired device name and select "send name card."
Hope it helps,
Audrey