I've had two experiences with companions so far. Khem Val and Mako. Heres some feedback about both.
Mako: I played a BH during the course of the beta and Mako is pretty crappy for a starting BH companion IMO. She seems to frown on every little negative thing I do. In the end I felt really annoyed by her presence and as soon as I got the Devaronian (can't remember his name it was the last day of the beta) I dropped her like a hot potato.
Khem Val: Khem Val is fucking awesome. I'm sorry, hes a PERFECT fit for an SI. He approves of me shocking the crap out of people and then demands that I heal him. His character seems so exotic in many ways, and I like finding out tid bits about his story. The SI story so far has been kinda bland for me but I stick around for lightening and Khem Val.
Share some of your experience with companions. I'd like to know who else is a fairly interesting companion to get.