This is a fantastic product! Easy to use, tasty and super efficient! i love the fact that you can change the batteries, i have bought a few spares and an external charger and i can use the vape for up to 3 hours now! I also feel like it will extend the life of the product. Ive managed to give up tobacco for 12 weeks now and havent combusted anything in about ten! i definitely put it down to this product, as Ive had other vaporizers in the past and not been able to kick those bad habits. 5 out of 5!!!