The subzero does look interesting but I have to say that the Santi has been really impressive so far, I now have two - 1 400grm and one thinner one for summer dives. They also do great liners for drygloves and thermal socks.
Xerotherms plus Santi and drygloves makes for a warm dive.
Clare is a
Santi dealer if anybody is interested. I think Mark Powell has been trying out the subzero but official launch date not until March.
HTH
Ian