like i said, I HATE my original 160.00 G-pen. its about as worthless to me as reggie weed or a bad hangover. I think most of the pens out there are all copies of one another. huels Gpen is exactly like my power pen, which is the same exact copy of a buddies pen, and another buddies vape pen (all are different makers, but all exactly the same parts). nowadays, I think its all about name on the front, otherwise they are all the same.