Guild Wars 2

Irenio CalmonHuang.2048:

• Gyros now start their cooldown upon summon rather than upon gyro death. Medic, Shredder, Purge and Bulwark gyro now have a 35s cooldown, up from 30s. Sneak Gyro needed a cooldown that was longer since it would otherwise have potential 100% uptime, so it now has a cooldown of kitten , up from 30s (its 30s duration remains). This should encourage players to keep them around to gain their benefits for longer.
  ~ Irenio

This means we can get our cooldown start on summon back to spirits! Right? RIGHT?!

In exchange for a 40+ second recharge, sure.

Electro.4173:

In exchange for a 40+ second recharge, sure.

Worth

Not really worth it i would think.
The way spirits are now, they still provide buffs for 15 seconds after dying. Which means that when spirit dies, we only pay a 5 second downtime on buff. If we increase the cooldown and the spirit dies soon after being summoned, we would have higher downtime on spirit buffs.