This review is for the cloudious 9 NX. The only real downside is that the cartridge makes things more complicated, as the unit won't start if it doesn't detect the cartridge. Water around/on the contact points for the body and cartridge will make the unit not start consistently. I ran into this issue during the first hour, but I eventually managed to get it figured out. Thereafter, the unit has worked reliably. The cartridge also gets hot, but never to the point where I was worried about getting burned. They provide a silicone case that the unit sits in which makes the unit easier to hold and will stop you from touching hot metal while in use, but the cartridge will still feel warm even through that. Temperature is controlled via the very bottom of the unit which is twisted to change settings. The silicone case hinders this action a little which makes it slightly harder to change settings with it in the case. The cartridge system is a vast improvement over the previous model which forced you to pour out the water to clean the chamber. Overall, with the addition of a replaceable battery (currently sold out, lol) and a dramatically easier way of cleaning the chamber, this is the perfect water-cooled vape, as long as you aren't trying to leave the house with it. It is expensive, so I would consider it more on the luxury side. If you're looking for a low-hassle way to get smooth, cool pulls each time with easy cleanup and you're in a position to splurge, this is the one. The way the cartridge sticks out on the side gives the profile of some futuristic techno bong, which is essentially what this is I guess.