lestatdark on 21 February 2014
It's rather pointless to use them. Got through the entire game 100% on hard without purchasing a single SP. Not only is it a shameless money-grabbing practice imo, but you get enough SP by just resting the console (and you'll be resting it a lot in order to rebuild Norende).
Alas, Bravely Second becomes only a quick "rescue me" mode on the latter stages of the game if things go sour in some of the optional boss battles.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"