I've recently picked up 3 DNA 40 mods (all within the last month or so) after making the switch from mechs. A Hana V3 Mini (with the floating pin, not the solid one), a Vapor Shark Vaporflask, and a Lost Vape ESquare.
I love the Hana. I got the scratch and dent because I don't treat my mods like artwork, and the $ difference was worth it to me. Overall, the finish is great, the buttons are fantastic, the 510 is perfect, and I have no complaints besides battery life. The Mini has an 1800 mah lipo, which performs great, but barely gets me through a work day. I *love* the size though. If you were to pick up the 18650 or dual 18650, I think you'd be very happy. I've heard about problems with Hana's, their QC, hot glue etc... all I can say is mine looks great, and performs great. It's a keeper.
I picked up the ESquare to try out dual 18650, and because I liked the form factor (I also got it pretty cheap, damn near new). It feels fairly solid (the weight of the batteries help), but definitely not on par with the Hana. It has the larger DNA screen, and I don't think I could bring myself to order another mod with the smaller screen. The square-ness looks good on the desk, but doesn't fit my hand like I'd like. I think the more rounded corners on the Hana are at least one factor.
I only got my VS Flask yesterday, but think it might be my end-all be-all mod. It's got the large DNA screen with an (I think?) gorilla glass top, so it sits nice and flush with the top. No collecting of dust and crap. The buttons (IMO) are the perfect amount of clicky, without that "tinny" feel you get with some tact switches. The coating (reminiscent of the Ego batteries) gives a bit of grippiness, which is good for a heavyish dual 18650 mod, without the least feeling of cheap-ness, which was my initial concern. I can use either my forefinger or my thumb on fire buttons, so for me personally, the button is in a great spot to use either left or right handed. The battery doors (supposedly revised) are easy to open, thread smoothly, seat evenly, and close well with the magnets for the latch-type thingy. With 2 3000mah LG 650's, I've been vaping for about 30 hours at 30+ watts, and have well over half a charge. And the shape? It fits the hand like every other mod wishes it could. It...... is..... amazing......
If I had to get rid of every other mod I've ever owned, I'd keep the flask, no questions asked. The price tag ($160) had me wavering at first. Some "high-end-only" people would consider that a "cheap" mod, but that's big money for other people like myself. Once I had it, and got a few hours of use out of it, it's an honest to god bargain.