awesome price and more appropriate imo. I love the 4.0 design i just wish it got hotter. doesnt put off enough vape for my liking. some like it like that. i just prefer the green setting on 3.0 so I use that device 95% of the time. I use to use the red setting for my last bowl but i dont go that hot anymore. I really really like the 3.0 vape and I use my 2.0 batteries with dopen cartridges and they work great!