The left side of the tree is for mostly brawler/infighter builds. Get in range, quickly figure out the weak points you need to focus on, maintain info even if they get behind you for a couple of seconds, get off radar before the rest of the team turns on you.
The right side is mostly for ranged builds (sniper and LRM). Better sensor range, and additional target time when out of LOS. Zoom still where it was before.
Prized Seismic (some call OP) is locked behind 7 SP spent on on other skills. Enhanced ECM locked behind 6-7 SP spent on other skills. Also, Radar Deprivation requires 5 SP spent on other skills to unlock fully.
Might require dropping available SP to 86 or 88, but better than making people waste SP (and associated XP and CBills) on skills they don't want.
Edit: Fixed left/right.

Edited by KodiakGW, 10 February 2017 - 11:35 AM.