Well, I tried playing AST yesterday with the buffs and I have to say: It's AWESOME!

I'm not doing Alex Savage, but I think I can give my opinion on the job as well:

Before the buffs, I was running expert dungeons in DF as the three healer jobs. With both WHM and SCH I could heal ok and DPS ok to help raid, but I never felt comfortable with DPSing as AST. I felt like if I went on cleric stance for a sec I would ruin the entire run because I wouldn't be able to keep the tank alive and everybody would die soon after. As full time healer/buffer I never had MP problems at all and I didn't understand what people was talking about back then...

But now, with synastry and a lot of HoTs happening, I feel like I was free to DPS. But now I have a minor problem: getting OoM. I'm sure I'll be able to manage this little annoyance with the tricks everybody talks about (and I never saw a good reason to use), like extending LA or using a spear right before using LA, after all LA has a quelling effect on enmity, so I have to use it sooner than I would use SoS anyway...

Now I expect some love for SCH. I guess ET could add some MP boost or reduce the MP of your next affected skill(Adlo is too mp consuming, don't you think?). Reduce cast time for Adlo and/or Succor would also be a good option.
But Dissipation is what we need more attention. Maybe if the bonus from dissipation worked on abilities as well, or if it would full your MP (since you should be out of MP AND out of Aether stacks AND with Aetherflow on cooldown to use it) or if it would trigger a proc to summon your fairy for free or anything that make it worth using Dissipation we could see more people using it. The way I see it now, the bonus you get to sacrifice your fairy is not worth the loss of her.