Excellent toothbrush. You can save a lot of money if you buy this Limited edition instead of Genius X 10000. The only difference is 1) it comes with a standard charger for 110 V (does not support 220 V), 2) it does not have a USB charger for the travel case. The toothbrush itself is exactly the same. If the travel items are important (traveling a lot), buy 10000, if not, save about $100 and buy this Limited edition.