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Personally I'm not sure this works. I bought this for my first child. He had the avent bottles and I thought that it seemed like a good way to wean him on to a beaker. He did like it but maybe a bit too much - he didn't want to have a beaker after having this and I think it would have been far easier to have just gave him a beaker rather than trying this (in between method).
It's also nice to be getting away from the look of a bottle as your child is getting older and I'm afraid that if they get stuck with this being their favourite type of beaker (and they do always have a favourite beaker) you end up with a toddler looking like he is drinking out of a babies bottle!)
With my second I gave her a beaker straight away rather than using these bits to convert and like all children she was fine with it.
Change bottle into cup! These spouts turn bottles into training cups and help your baby to learn to drink without too many accidents!