I have a Reo Grand and it does work well. It is well built, very solid, and does not leak. As Dayvape says, the extra liquid gets sucked back into the bottle, so you do not flood the atty. I absolutely love the bottom feeders! I had the Ali'i before I got the Reo, so I was used to the side button on it. That made getting used to the top button on the Reo a bit of a challenge, but I got used to it quickly. For me, it is much easier to use the Ali'i one handed because the bottle and the button are next to each other. You just move your finger up and down between them. With the Reo, the bottle opening is on the side and the button on the top, so I have to turn the unit in my hand to squeeze the bottle, then turn again to use the button. It took awhile for me to get used to that, but then that's because I was used to using the Ali'i first. It's different, but not bad. The Reo is a very square box, without rounded corners, and the corners can dig into my hand if I don't hold it just right. I now 'cradle' the unit in my fingers with the bottom of the unit resting on my pinky finger. That works well for me. I think part of my problem is that it's just a little bit too big to fit comfortably in my hand. Or it could be from being used to the Ali'i that does have the rounded corners and is just a bit smaller so that it fits perfectly in the palm of my hand. I choose to go with the Reo Grand because it used the 6ml bottle and the 18650 battery, both of which are favorites of mine. The only negative I can think of is that the battery cover slips a little bit - moves up and down while vaping. Since I changed the way I hold it, that doesn't happen as much as it did at first. In my opinion the Reo is a well made PV, is easy to use, and works great.