Alright, I have finally gotten SCH, and am on my way to making it my main class (19 levels before I catch up with my PLD!). I wanna post some things I noticed, so I can learn if they're true or not:
I have 3 bars: Healing, DPS, and Cooldowns/misc. The Healing and DPS are my main rotations, the third is for stuff like Protect, Summon, Sustain, and Resurrect: stuff I won't be using often, but occasionally. Both my Healing and DPS bars have my Eos commands on the left side, so I can Embrace whenever I need to manually.
I have seen no reason to use the "Place" command/"Heel" command. It's faster to just walk where I need my pet to go in the automatic "heel" mode. There is very rarely reason for me to move and interrupt her; I can just park near my party and Eos will Embrace away. 25y isn't too short of a distance, really.
I had no idea how easy micromanaging Eos would be! She casts Embrace automatically, so I very rarely have to tell her to do that. I still have it on the bar, because sometimes you need to manually get her to prioritize the tank. Mostly, it's just the cooldowns; and yeah, they're crazy easy, especially since Whispering Dawn has a pretty short cooldown.
Basically, in average dungeons, it feels like I'm two classes. I still keep the party alive thanks to MP-less Embrace spamming, but I can devote almost the whole dungeon to being an extra DPS; in Cleric Stance, I have the same power as I did when I was ACTUALLY a DPS as an ARC. That means that the dungeon goes significantly faster, because it's like having a Healer AND a third DPS. Also, when I DO need to heal, I basically heal twice every GDC because of Eos, and I have a nifty heal/barrier spell as well. It feels way better than playing as a WHM for me; it feels like there's a massive safety net.
So, that's my first thoughts on playing SCH. Feeling pretty good, so far.