My KDF engineer is loving the new traits. The one that gives bonus power to all subsystems when using EP2X skills and batteries...holy smokes, I'm in a nearly continuous state of 100+ power in EVERY subsystem. It's crazy. Some power from equipment bonuses, some from console bonuses (plasmonic leech), and skill point allocations.
With the Warp Core Engeneer DOFF assigned you can also increase your ship's power levels with Emergency Power abilities. It's great in a battle when I can increase my weapon and shield power at the same time.