I had asked Focus support about the white puck/filter in the mouthpiece and confirmed it is ceramic and can be cleaned with ISO.
According to PIU the Wax Pod is also made of ceramics.
http://www.puffitup.com/Focus-Ceramic-Wax-Pod-p/fcv.112-wax_cart.htm
I have left both the Focus and Focus Pro charging unattended overnight and they have both shut off the charging process once the battery was fully charged. I have left the Focus Pro overnight like that so often I can't count the number of times. I also have a external Nitecore charger I use often because I think the Nitecore is more efficient and better for the battery but that's conjecture on my part. The Focus Pro has a pass-through function so you can use the device when plugged in. I haven't tested the pass-through function because it can weaken the battery by turning the charge process on and off a bunch while the unit is being used.
Suggestion for optimal vaporization: The Focus reaches oven temp so quickly that it hasn't sufficiently heat soaked/conducted-heat to the herb sufficiently like the Solo did. The Solo takes double the time to reach oven temp and its conducting heat to the herb that entire time. I usually let the Solo alone, even after it reached level 7, for 15 additional seconds to guarantee a good heat soak/cloud on the first hit. Try giving the Focus an additional 30 seconds after it reached temp before hitting it and see if the clouds appear more to your liking.
I also noticed that the Focus oven temp, even at the higher temps, is easier to over-run and get cooler than the Solo. I noticed that the Focus would hit hard at the beginning of the hit and lower toward the end. Again...my guess is the oven is easier to over-run/cool slightly. You can compensate for that by closing off some of the airflow with the slider. I actually like the fact that it hits harder at the beginning than the end because it drives the majority of the hit deeper into the lungs and trails off causing less waste toward the end.
All of the above is my personal opinion and your mileage may vary.