I've been using my new Nano for about a week now and am very happy with it. I've found that I like setting 7.5 for my herb. Perhaps that's higher than most users' preference, but it works for me.
I did run into an "overheat" issue last night, but that was my own fault. Because of the relatively small bowl size (at least compared to my Solo stems), I find that I like to have two Nano bowls at night a couple of hours apart. So last night, I turned my Nano on, set it to 7.5, and 10 minutes later I was enjoying some Jack Diesel.
Unfortunately, I forgot to turn it off when I was done with my first session. So a couple of hours later, I go to turn the Nano back on for my second session and realized I never turned it off from the first one. As a result, during that second session I found the Nano quite uncomfortable to hold. It wasn't burning me; it was just hot to the touch. I found myself using it with two hands, one on the stem and the other supporting the Nano using the plastic plug going into the body. Not the "right" way to hold it, to be sure, so I will have to be more cognizant and remember to turn it off after each session.
Now for a question. I know the screen is situated within the stem at a certain height and you are supposed to use the included pick tool as a guide for proper placement. But can I deviate from that? In other words, can I put the screen deeper into the stem in order to increase the bowl's herb volume? If so, how much can I increase that volume while ensuring the heating element can do it's job by providing enough heat to vaporize the herb properly?