hi avocado,
yes, soup will spill out just like the normal lids we have in our kitchen now. I happened to got a set of Neoflam Venn at my house, ordered by a customer. Shared with you some pics of the lid. There is a small hole on the glass lid, like our normal lids, to let steam go out. But soup will still spill out with this kind of lids.
compare Venn and Philos, personally I prefer Venn as the whole pot is coated with ceramic, including handles, this make it easier to clean, and looks nice in colour.
Happycall and Kitchen art got a long handler on top of the lid, is to help lid stand on its side. Some mums likes this design. So far, I found all the steam-release lids are with such a long handler.
I'd like to clarify one thing I stated before: Neoflam pot make in Korea is not for induction cooker. Only the design made in China, with an inductive disk inserted at bottom of the pot, could be used on induction cooker. Sorry for my mistake.