I have a Honda 2000i. This year I splurged and bought the 2000i companion.
Of course I was anxious to try it. So when we were up hunting this fall we had two days that got some over 80 degrees. What better excuse to try it.
I got them both out and hooked up the parallel cables and fired them up. I left them both on eco mode and turned on the AC. They started it, but the AC protested a little bit. They then backed right down and just purred away. Next time I took them off eco when I started the AC. The AC liked that a lot better. No squeals of protest this time. I then turned the eco on and they slowed right down.

What a nice set up Honda has come up with.
I tried each one separately when I needed power. They both performed great.
One thing that puzzles me, is the companion is some what lighter in weight then the 2000i.
Has any one tried theirs using the bonded ground plug?
I made up one of those before we left home. I checked with it plugged in and with out it. Using the BG plug, my meter showed everything normal and good. With out the BG plug it showed a lack of good ground.
One thing that surprised me was it didn't affect the surge guard like some claim it does, or suppose to. My BG plug is to big to fit in the 110 recept. when I use the 30 amp adapter plug in the other recept on the 2000i. I will have to find a smaller plug and make up another one.