Which power was it in Second Son that people recommended not bothering upgrading? Was it Neon? I remember talk of not being usable during the end game or boss or something. I'm just forcing myself through before First Light comes out so I'm not bothering collecting all the shards right now. I did get permanent speed for for travel though.
I liked Neon the most so far personally. The Karmic streak does work, and that infinite running thing is dope. Woulda been cool if you could mix smoke and neon, but they're easy enough to swap between when you want. I haven't played in a while though, and I haven't gotten whatever is after Neon yet, if there is anything.