Re: lithium sulphur
From a power handling stand point (1 C or more current), the Winston Lithium sulphur cells have the highest specific resistance of any of the 20 Li-ion technologies that I have analyzed. That is, a battery of given voltage and capacity will have the highest internal resistance (and the lowest efficiency) if built with these cells compared to using just about any other Li-ion cell. Specifically: 45 % more resistance than standard Thundersky LiFeYPO4, 2.5 times the A123 20 Ah pouch, 4.7 times the Valence cells, 14 times the Kokam high power LiPo cells.
(I am not talking about energy density in slow discharge application; I am just talking about power handling and efficiency in power applications.)
Secondarily, a battery using these cells will require a BMS with twice the tap points as a battery using LiPo cells (unless one were to monitor 2 cells in series as a single cell).
I believe these cells are worthy of consideration for low voltage (<= 12 V), long discharge (>= 10 hour) applications.