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I bought these stacking cups direct from the Nuby website over six months ago. They are nice and large so they were helpful for my little boys fine motor skills as he learnt to stack them up and knock them down. The price was good at just £4.99 and I have seen them on sale recently too. The main issue we have is once he learnt to stack them properly, just five cups wasn't enough. At just eighteen months old my son is capable of stacking over ten items neatly without knocking them down so these cups limit him. The other issue we had was the outer edges are very frail, it didn't take much for one of them to snap so we are actually down to only four cups as I threw the broken one away due to the sharp edges it left.
These cups are definitely good for younger children (9 months to 15 months was all my son really got a use out of them for) as the colours are lovely and bright, mainly primary colours which contrast well together, and the cups are a chunky size so even if your little one can't stack them, they will be able to hold them and pour water through them at the very least.
They are a good price and worth it for the short period of time your child will get some use out of them, we have put the other cups (none broken ones) away for our next child. Hopefully they won't break in storage and we can get some more use out of them next year.