Playtest results from No Stars In Sight are quite promising. Powered armour troopers can lay down a lot of fire power and if deployed well, can outfight a much larger force of conventional troops, however, they are also quite vulnerable to anti-tank weapons.
This puts them in an interesting position where they can be extremely resilient or extremely tough, depending on the situation and helps integrate them better.
Players who like their power armour troopers may find it of interest that each trooper essentially acts as a mini-vehicle on his/her own.
They'll be able to advance under fire much easier as well, since they are not subject to the normal infantry reaction fire.