Advantages do you want to do ONLY oil? well, now you can. a small dab of oil produces less vapor than a bowl of flower. do you want to spend 3 minutes chain-hitting a bowl, stirring, hitting it again, stirring, emptying, or do you want to spend 3 seconds dropping a little ball of oil on the nail and walking away stoned as shit? it just makes the vaporizer more versatile. i have an oil rig already anyways, and I can easily see the convenience of an "electric nail" that isn't the $800 HE e-nail.