We had the Avent one & DS wouldn't drink from it at all, I think the teat is too hard. So I bought a TT cup too as it has the silicon teat.....but...it leaks all the time!! I was just complaining today to DH how I'm sick of it leaking everywhere. We also have one with a staw in it, not sure what brand...DS can't yet suck from it but it never seems to leak. I know what you mean, it's so annoying. I like to give DS his cup when we go walking as it's hot, but it seems to go everywhere.