Easy to use. No mess. Battery charges quickly. 2 strengths of vape is a good idea. My only reservation is that the E liquid seems to evaporate quite quickly, even on the low setting, so may not be as economical as other E - cigs I have used in the past. 3 years. However, the E liquid quality is very good.. The battery charge lasts all day and I am not having to refill a tank all day.