It really depends on what class you are playing that determines how useful that is. On Samurai for example, it can be pretty useless since one of the passives you get using it greatly increases your Skill Speed anyway. Then there classes like Warrior that doesn’t need any and just focuses on Crits, despite being the Tank, and doesn’t need any Skill Speed buffs.

There are some that needs some at least, like Gunzerker, but that’s just what I’ve heard since I haven’t tried it yet.