Mixed feeding - Tomee Tippee's new mixed feeding bottles - do they work?

[Wills]

I've bought two to test the waters so to speak but wondered if anyone else had tried these and what they thought. I tried them out today and initial thoughts are both good and bad. He seems to take a really good hold of the teat i.e. like when he's on my breast and thats lovely to see/hear etc but on the negative side the teat very quickly inverts and an awful lot seems to pour down his cheek.

Erm so no one else using them???

hi, i've just started using them and they are working very well. are you making sure that the valve bit on the teat is not blocked by milk? think i read that is has to be on the upper side to be able to work?
kt