Yes lithium cobalt battery's need to be managed appropriately as they are a less forgiving and a bit more spectacular in a thermal runaway event.
If you want performance though very high energy density- light weight pack that can knock out some serious kw then that the cheap HK lithium cobalt packs are amazing bang for your $.
A member of the Perth branch of a EV car club I am in has build a 238kg super bike using the hobby king- turnigy 40C lipo (RC model lipo) the bikes battery pack is 700 volt , 184hp at the back wheel and 250kph+http://forums.aeva.asn.au/voltronevo-jonescgs-new-electric-race-bike_topic3553_page7.html
I thought 100v of lithium cobalt - 100A controller was scary on my E trike. That bike is insane.
Amazing stuff, HK lipo. I wont be getting rid of mine anytime soon. Just take appropriate safety precautions and it's fine. Treat it the same as one would a volatile liquid fuel. I keep and charge mine in a 5mm thick steel box in the shed so no harm in the event of component failure of moment of absent mindedness.
That said I agree for a lazy commuter bike that you want to wheel into your apartment and charge next to your bed stick with lifepo4.
Offgrid 2008, Selectronic PS1 6kw/48v inverter, x 2 Midnite solar classic 150 MPPT, 3960w NE PV 24 x 165w BP panels, 4200w NW PV 21 x 200w DAQO PV, 16x400ah lithium.