Basically, sanyos won't choke themselves off, while apparently these cells increase their internal resistance when you try to pull more current.
and yes, these give you extra capacity, but at the cost of having no protection circuits that match them yet. i.e. you better be watching your voltages...
Protection circuit design is done and it is in production right now.
Bare cells will not be overcharged at 4.25V, nor over discharged at 2.1V
Short obviously cannot do anything to bare cells.
Bare cells can handle almost anything you "throw" on them.
Most importantly - very safe to work with.
Cheers