Review (2/5): Requires four AA batteries every week.
The brush works as well as you would expect a $17 motorized brush would work. The real problem is the life of the batteries and the potential cost. I used it twice a day for one week and had to replace the four AA batteries. It's probably fine for travel, especially if you don't want to risk damaging a higher priced machine. If you're looking for something for daily use, look for a rechargeable brush.