Been using my air II two to three times a day since January without a problem. This is a great vaporizer, it's simple to use and portable. PROS - Great price, fast shipping. - Small, light weight, and very portable. - Durable, tough, solid. - Easy to Navigate menus and change settings, plenty of settings as well. - Good battery life, charges quick enough (can also be used plugged in). If you don't want to wait or use it plugged in you can swap out the battery. CONS - Maybe swapping out one of the included accessories with a 90mm (best of both worlds) tube could improve the "first impressions" of people. - battery level displays percentage only when charging - Micro-USB... especially in this day and age, there are better ways to recharge