Pros: Really liked the large number of modes – can be tailored to any need, functionality is top-notch. The device itself is made with sufficient quality and feels pleasant to hold. Disadvantages and main disappointment: Weak battery. The charge lasts very little. This is the main drawback that spoils the experience of using it. The second major drawback is that it cannot work while it is charging. If the battery dies, you’ll have to wait, which is very inconvenient. Expectation: I really hope that after several full charge/discharge cycles, the battery will slightly “settle” and start to hold a charge longer. If not, this is a real problem.