It must be a really good toothbrush!
I know my dentist tries to get my family to buy the ones with the sonic cleansing and what not. I mean its a good investment if it lasts a really long time, but I know I would never buy a toothbrush for that much.
I feel that it is really expensive for a toothbrush, but hey, if they want one and are ready to pay that price it's their choice, right? I personally like a normal toothbrush that the dentists give, but hey, if it keeps their teeth cleaner and stuff, then why not own an electric one.
Wow, ?110 for a toothbrush? I didn't even know they got that expensive..
I do have an electric one myself and I got it for about ?3. I wouldn't spend more than ?5-10 on a toothbrush.