After almost a year of using the ProVari, I have never once had an issue with it. It has been through the ringer and has always fired right up.

The bottom line here is that if you're not that concerned about the looks of a product that will be large and a little unwieldy regardless, the price here to get a variable voltage or big battery mod is a steal.

Overall, while the cartomizers have some issues with the size of the hole used, it's no knock against this product as a whole. The design is great, it doesn't leak at all and it allows you to vape for days without any dripping or any work. If you're looking for something to cut out the constant filling and re-filling, this is a great way to go for a very small investment.