Impetus and Footwork are really aggressive abilities (doing WS between 30k & 70k in solo with Dragon/Tornado Kick). I often use Dodge and it is really potent, that extra accuracy from Focus let me WS without worrying that much with my accuracy.
Boost is great, but the fact that it get a lower timer with haste stuffs make it useless or inventory problem if we have to rely on slow+ stuff, it'll bring your boost down from 1200~ TP to 200~400 TP.
The delay to engage is also making it not an interesting skills to use, it'll become a situationnal one then.