Guild Wars 2

So .. Bulwark Gyro.
Deploy a bulwark gyro to apply Watchful Eye to nearby allies.

Damage Damage Reduced: 50%
Half of incoming damage is taken by your bulwark gyro. Watchful Eye (4s): Half of incoming damage is taken by your bulwark gyro.
Miscellaneous effect.png Number of Targets: 5
Duration.png Duration: 15s
Radius.png Interval: 3s
Radius.png Radius: 600

Order your bulwark gyro to self-destruct.

Damage Damage: 160
Unable to activate skills; stacks duration.[sic] Daze: 1s
Miscellaneous effect.png Number of Targets: 5
Radius.png Radius: 240

Project a reflective dome around you.

Duration.png Duration: 5s
Radius.png Radius: 240
Reflect Reflect Missiles

Feedback
Create a dome around your foes that reflects projectiles.

Duration.png Shield Duration: 6s
Radius.png Radius: 240
Combo Combo Field: Ethereal
Range.png Range: 1,200

Just the toolbelt skill of Bulwark has 1/5 uptime of a mobile reflection field whilst the mesmer feedback has 1/5.6 uptime.
Bulwark Gyro also contributes damage reduction, damage aswell as a daze.

Does Bulwark Gyro need to get toned down or does feedback need a cd decrease/duration increase?

These skills are completely different though. The only similiarities are that they are reflects and they are round.

You can’t aim Defense Field, it will always be around the scrapper. (Can be both good thing or a bad thing.)

It also doesn’t last as long.

You can pretty much toss Feeback in the middle of a teamfight without getting into any danger at all. You can’t do that with Defense Field.

Honestly I wouldn’t change either of them.

Imagine if the only way for you to take Feedback was to replace one of your F1-F4 skills with it, and you would have to take Phantasmal Defender as one of your utility skills aswell.

Defense Field is the only reason why I would ever take Bulwark Gyro over other skills.