The implement works very well. In use, teeth feel extremely clean, and while lacking a spectroscope to assess claims that my teeth were several shades whiter after a week, I certainly didnt have that gacky feeling that you might get if using a less technologically sophisticated device, such as a stick.
There are, however, a few issues. The first of these is battery changing. The machine is powered by two 'AA' batteries, renewal of which is achieved by removal of the base section of the sculpted plastic handle. Due to the fact that water is frequently involved in toothbrushing, this base section is a very tight fit. Once the new ones are installed, replacing the base requires firm pressure against a rubber sealing ring separating the removable base from the remainder of the sculpted handle. The first design flaw I discovered is that if you get frustrated trying to get the base to fit securely, smashing the base of the whole object against a doorframe, or using a hammer (even a lightweight tack hammer) to ensure the base docks permanently in the handle results in fissures (or cracks) in the base. These fissures allow water entrance into the battery compartment, causing shorting of the batteries. Once this problem has occurred, then even repeated wraps of electrical tape, Saran wrap and duct tape do not provide permanent solutions as watertightness can never be re-established. Additionally, as water attacks the glue of the tape you have applied, brushing rapidly becomes a messy business, and a pool of assorted goo agglomerates in the basin.
A second technical problem with this toothbrush is its utility as piece of bicycle cleaning equipment. In standard useage, a non-electrical toothbrush is a controllable, yet effective, (essential) part of your bike cleaning kit. The only trick is to have the correct cleaning solution at hand for the toothbrush head after use on the bike as any degreaser left on the head leaves an unpleasant aftertaste (when later combined with toothpaste). However, this electrical device has no frequency or amplitude control (of vibration). Thus, if you have applied cleaning fluid to your rims, even the gentlest application of the tool results in uncontrollable spatter across a considerable diameter. In tests, the newly painted wall I tried this against required repainting across a vertical diameter of about 1.5 metres and horizontally, the carpet has been ruined from between 1 to 1.34metres.
All in all though, an excellent product, and if these minor defects are adjusted in the new versions, I'm sure we will be giving it five stars. Rating: ***