This is a great strain, I love the taste and I have purchased it a couple times. I have only once had an issue where the cartridge would not work. My pen would start then just immediately stop. I was confused and tried friends batteries but found that it was without a doubt the cartridge. I was able to empty it and still get use of the thc oil, but it wasn't without hassle. All in all I find this to be my favourite cartridges so far.