I consult for over a hundred small wineries and frequently recommend Flextanks. They breathe like a barrel — unlike a stainless steel vessel, they allow off-gassing as well as oxygen uptake. In concert with well-selected oak alternatives can yield aging results comparable or superior to a good French Oak barrel at a fraction of the cost. We prefer their design to other plastic containers because they are designed to be topped and don’t have any air pockets.
The Apollo egg is a wonderfully convenient fermentation vessel, so easy to load, punch down, secure for fruit fly-free extended maceration, and dump into a press. Its corner-less design make cleaning a breeze.