I have the black and rainbow one. For some reason I like the rainbow one a little more than the black because the vape hits a tad harder and tastes different. Either way, I have used both now for nearly 2 years! Daily. The charge is amazing. Keep these products! I also love the colored vape 1.6Ml cartridges a lot. They also last longer and taste better than just the clear or the XL cartridge in my opinion. I have been using this brand for nearly 4-5 years now. I do not want to stop smoking and I enjoy the menthol liquid by Crown 7 too.