ORIGINAL: TedMo
I know many have raved about the 123 batteries however from my limited experiments with them they do have benefits but not that great for smaller aircraft or electrics. They are large and heavy and don't have equal voltage to Li Po's. Guess it depends on what you wish to use them for.
Wonderful!! Don't go near those darn A123 packs. The price has been driven up high enough by those that want fast charge and 1000 cycles of dependable power.