I have Energy Aura for my stalker, i have not had any problems with it in solo or in group, infact solo i nearly never die, and i find myself scrapping alot because they don't seem to be causing me much damage. In groups i do have to do a little running in and out of battle. But energy aura does allow me to stay in the thick of it to make sure i finish of my target (as its my job to kill of bosses and LT's). But i have not played the other secondarys to compare them.