Philips Sonicare 3 Series Gum Health Electric Toothbrush

This brush is great...when it works. My first brush failed after about a year. Philips replaced it. Pretty decent customer service, but it took a few calls. I've now had my second replacement brush for 10 months, and it has also failed in the exact same way. The technology is based on vibration in the brush head post which is transferred to the brush head - hence the "Sonicare." When it fails, the brush head post gets really loose, and all the vibration stays in the handle. This makes it completely ineffective for brushing. I'm not sure if it was a discontinued unit, and they just sent me a left-over off the shelf. I say this since it was delivered in a mailer without packaging. The newer models might have corrected the issue. If yes, why risk another terrible customer experience? Needless to say, I will not go for a third round.