The answer to your question is test..test...test. Don't take anyone's word for it - except maybe for someone like Clayton

I can say though that your headline is weak. The opening 'Who Else' is tested and tried but the actual offer lacks the right hook. My mind asked two questions...'why do I want one working for me day and night' and 'wow isn't that going to be costly?'...You don't want to a headline that ask a question that gets answered with anything but yes...and for that the offer has to be utterly irresistable.