So Astro secondary stay is......

[MilesSaintboroguh]

Spell Speed also affects the strength of your DOTs and HOTs, something to keep in mind.

[TatoRazzino]

Spell Speed also affects the strength of your DOTs and HOTs, something to keep in mind.

The rate is very low and the det/crit make up for it.

[Lyrica_Ashtine]

Spell Speed also affects the strength of your DOTs and HOTs, something to keep in mind.

I second this:

The rate is very low and the det/crit make up for it.

And back it up with this:

Crit is pretty much uselles if play more in diurnal, they will became overheal almost all time and you don't have control of this, i get trolled by RNG all time whit the cards don't wanna to focus on another RNG thing to troll me , but if you play more on nocturnal they can be very good for the shields.
SpS is good for the HoTs, faster heals and faster DPS I fail to understand why he is the stat to avoid.

Because spell speed doesn't have much impact on HoTs: http://forum.square-enix.com/ffxiv/t...-Sucks-for-HoT

A difference of 200 spellspeed equated to a 2-3% change in regen tick potency, a difference of 20-30 hp per tick, on average.

(Disclaimer: I haven't bothered checking the spreadsheet)

HoTs don't have a lot of potency: 140 Potency on Aspected Benefic in Diurnal Sect. If we were to translate the 200 spell speed increase into potencies: 2-3% of 140 potency is a mere 2.8-4.2 potency increase for every tick. Here's another post on bluegartr:

Without a ton of accuracy, you can say that roughly 44 Critical Hit will raise your Critical Hit Rate by 1%.

source: http://www.bluegartr.com/threads/125...3.0-Bardshrekt

200 critical hit rate, for easier comparison with spell speed, is an increase of 4.55% crit chance. Which in turn can be translated into an average healing increase of 2.27%. Roughly the same as spell speed.

Now if we assume Determination has a comparable value, spell speed isn't worth taking at all.
For one: Spell Speed would mainly benefit HoTs. It decreases your GCD by a tiny bit, but does not directly strengthen any spells nor does it help your MP management
Secondly: Unlike spell speed, determination and critical hit rate affects nearly your entire kit. Be it healing spells, healing abilities or damage spells. Increased average healing with all your spells can also be translated into hp recovery for every MP spend.
Lastly: While spell speed does not hold any obvious or more direct merits, secondary stats hardly have any effect right now. Secondary stats don't matter much with current gear. But it's something to consider for later patches.

tldr; stats have comparable increases. Crit/Det still more valuable as it affects entire kits (in both sects for astrologian), unlike spell speed.

[Starbirth]

IMHO crit seems to be the main secondary stat for Astro since it lacks the clutch healing of the other healing classes. It can lead to overhealing but ive never had a crit Benefic II or ED steal agro unless the tank is seriously bad and in that situation a normal Benefic II would steal agro anyways.

The last stat either goes to piety/det. SS in my experience is absolute garbage on astro.