I was just reading a thread about this on whirlpool...
(I'm looking to move "bush" in the next few months.)
Different reactions on this side of the ditch (last 4 or so posts on the first page anyway).
It's hard to trust guys that sell batteries like the guy on that forum critical of lead carbon they are always going to be negative if they don't sell it generally.
As I understand it this is the same as a lead carbon battery so it's not a marketing gimmick.
Edited link to make clickable.