I personally love it, if I'm soloing a mission or rushing to a party member, I use it to break a crowd.
I use it differently in the case I Dash infront of normal monsters thus the bomb exploding on impact, me dashing through the monster, then continue dashing towards said person that needs healing. It's so much fun to use on monsters that get knocked back. I won't say I use it frequently but dammit it's usefull.
Also in pvp, when someone's right behind you chasing you, a quick dodge in the same direction will always knock them down as they can't tell the difference between the skill and a normal dash until they explode. Even if they see the bomb they usually move from it's range, giving you some time to heal, wait for a skill to recharge or plan your next move.
I've personally never been in a Pvp without using this skill. It a great knockdown move especially when facing button mashing Knights who unsuspectingly move towards you.
Also the one reason I love it, is that it looks lik Eir did an explosive poopy. :3