I'm a little shocked at all the boom hating going on, lol (i used to be a hater, but not anymore). The only bad thing about it is the cool down IMO, and it is great for aggressive engis like myself. I know i'm a little late to this gathering, but since the thread is still high up on the list, i want to offer up my opinion. I've noticed when playing on my op, even with a com in the party, there are times when i need to use health stims. It's not the com's fault, the op does heavy single damage and is bound to draw aggro from a single enemy who takes time to kill. Using boom in mobs (assuming you are healing as well, which every engi should be doing and will also build up aggro, and using trans when available) will help keep any aggro the com doesn't get on you instead of the squishy op. ops appreciate not having to use tons of stims in a run.

you probably used those extra skill points already, but maybe this can be helpful to someone else.