Hi Georgie,
I haven't yet as I am not too keen on the flavours. I am going to try one of each this week and see how I get on with them but I don't like the banana or chocolate shakes much (
i bought a blender mug from ebay - got a tiny blender in the bottom. As long as you add the powder to the water and whizz as you go its FAB!
was only about £3 too