Review (5/5): Works a lot better than sonic care with built in batteries
I've enjoyed this toothbrush because the built in rechargeable models would die so quickly which was inconvenient on long trips. If you put good AA rechargeables in here (e.g. immedion, r2G, etc. vs. ones that will die quickly like energizer rechargeables) you can easily get almost two months of brushing (twice a day for the full 2 minutes). Waaay better than the built in rechargeables sonic care offers-- due to the lower grade NiCad batteries sonic care typically uses, or smaller Li-ion. If you'll be using disposable batteries, you need the more expensive rechargeable sonic care models. Don't go filling up the landfill with your teeth brushing!