I have been using this particular tank for about 3 years. The first one I bought had to be replaced recently after dropping it several times; it lasted 2 years and is still usable after the abuse but the tank sits at a tilt and will leak do to the damage. I saw this same tank on sale so I purchased it so I could still use my existing battery and supply of coils. I prefer a tank with a replaceable battery so did not want to replace with a different product since I have been most satisfied with this tank. Unkike other tanks I have used, this tank does not leak!!