As for mainting the toothbrush itself; remove the brush head and wipe surfaces with a damp cloth. DO NOT submerge the handle in water.
For me personally Whitewash has been my first electrical toothbrush as I usually use manual, however now I wouldn't go back! The modes leave my teeth feeling fresh, smooth and I've noticed a slight increase in whiteness. Also with the manual toothbrush I used to over brush and make my gums sore, now my teeth are just clean and pain free.
Whitewash Laboratories Sonic Whitening Toothbrush - Link here