I've had my MVP@ 4 months, I vape Heavily, all day every day, and it's been a Fantastic device. I DID however notice a "Drop Off" in Battery performance after the first month of use, and in the last week a Full Charge has only been lasting 10 hours. Yep it's a genuine Innokin product, and I am ordering a new one as I write this as mine died last night.I THINK it's death is unrelated to Battery not staying as strong as it was, but ANY BATTERIES will degrade over time, I'm just surprised it's only 4 months from 24 hours on a Charge to 10 hours on a charge!! I am still buying another one despite this, as they are a fantastic bit of kit!!