"
Hmm PoB says ~23% more base damage and added damage on the stationary one with a bigger explosion. Seems it's a boss gem swap for the few remaining Spellslinger VD legends out there. I still don't see the radius being big enough for you to want to use it on any circle mechanic. I assume it puts a bomb on the ground that explodes after 1.5 seconds of waiting. So, a trap but worse.
Yeah, it's really an uninspiring gem...and I'm a VD enthusiast (Not even poet's pen).