I am HAPPY, HAPPY, HAPPY with mine too!!
I've been using it since Friday, and I really do love it. Here is my take, but it's only my experience and

, (be kind, I'm still a noob...LOL)
I have experienced a few of the issues the others have posted, but I think it must be user error on my part, or quality control.
Mine will start to seep (only a tiny bit) if the e-liquid level gets below 1/3, but only if/when I'm chain vaping at that level. So, I'm thinking that possibly the juice and the threaded areas are getting hot enough to allow a bit of seeping.
When it seeped the first time, I ran the coil unit under hot water, blew it out, and dried with a paper towel and let it air dry overnight.
Then when the second one seeped, I did the same thing, and put the first head back in (no seeping), until the fluid level reached below 1/3. So that is what leads me to believe it's something I'm doing to make the conditions "just right" for it to seep, or the one that seeped first would have seeped again as soon as I put it back in the tank. In other words, I think if it were defective, they would continue to seep, all the time.
The airy vape I think is just personal preference. Everyone is comparing to what they've tried previously. I didn't like it at first, but now I LOVE it....buy hey, I'm leaving standard cartridges....and while they've been fine for me for months.....they have their own set of issues too. I think all devices have some sort of quirk, or needed trick.....
ANYHOODLES, just my opinion, your milage may vary.........
Vape on y'all....
