I'm in the planning stages of my next campaign (ie: I'm about 12 months to start actually GMing it, I usually write down about 100 pages worth of notes prior to a campaign) and, for the first time, I'm leaning of actually using the Elemental Companion. In my view, it's probably the most game changing companion in terms of the absurd power it brings to the table, but I've decided to give it a spin and try to balance things out with the more exotic options other companions bring to the table and then some. And of course plenty of magic items for any non spell users.
Anyone got any experience GMing with it? I've slowly warmed to the idea, it's taken quite a few years, of allowing my players to feel like super heroes. I have numbers on my side anyhow ...