Hi im about to buy the Arizer solo. i have the option of getting the power adapter with it for only 20 dollars. I was wondering if any users found it useful to buy the power adapter or is it just a waste of money? please let me know thats the only thing holding me back from purchasing it. thanks. Also considering I have the extreme q (black) should I go again with the black for the solo or get silver? please let me know your opinions you arizer solo users. thanks.