I really have enjoyed my iPV3. I use my mechs almost daily, easier while working and driving, and my clones are cheaper, so less worry. I'm basically all regulated otherwise, now. It's changed my vaping completely, I love the consistent vape. I also used to vape kayfuns at 1.2, and now tend to build .4-.6 on RDA's with my box. .4 is fairly satisfying with a mech, but not as much as 55 watts regulated. I notice no harshness, just consistency.
They both have there merits. I use my mechs sometimes just to keep my batteries in rotation, which is why I want an iPV Mini 2. It is nice to be able to fix basically anything with a mech. Aside from some disastrous threading mishap, most everything can be remedied. And, my one Authentic, the Copper Vanilla definitely is nicer than any clone I have. Everything works well, adjusts properly, and it fires no matter where you press the button. I'm into regulated right now, but I could see a dual box, or another authentic at the right price in the future. Not now, though.