I bought this from a shop thinking it had to be good as it was a recognised brand name. Even with a replacement nozzle I could not get it to attach to valves without huge difficulty. Then one of the pistons blew and it ceased to work.
Astonishing! It's a pump for goodness sake- and it doesn't pump! It's not like I wanted it to fry eggs or something! It not being able to do that would not have surprised me- but a pump that you simply can't get to pump? That's just crazy!
I've had loads of these toothbrushes (as a family we've probably had 7 in as many years). I have not found one that cleans better- but they break down so often! The maximum lifespan we have found of any we have had is two years and a month or so (ie just after the warranty finishes!).
Ones that my wife and I share often only last a year (perhaps because we are taking the heads on and off each day). Our current one didn't even last that: seven months!