I've been waiting for these to be released in the UK, a lot of people rave about them but they have only just come over from New Zealand.
You can get cheap versions from China on eBay, but this is now on Amazon at such a good price, without having to wait for delivery. Plus this is guaranteed BPA free.
It works by suction so aparantly can be 'hands free' and best used whilst feeding / pumping the other side.
Can't wait to try mine.