Synastry is a bit op.

[Lacifarus]

I started out playing Astro this expansion, and while hands down it is the most fun healer, it is no where near as powerful as sch. I leveled my sch a bit to see the difference and once I got Indom I never went back to astro. Sch only gets better with higher levels. I used to prefer my whm over my sch but I feel it might be even stronger then whm now, granted my whm is still at 50.

Basically, astro is nowhere near sch in terms of healing output, utility, mitigation, anything really. It is way more fun imo though and if they look at the class a bit and change a few things around I'll probably go back to it.