Yeah, she's not the worst unit, but she's a 2-star (so good luck finishing her), and she's not exactly exceptional. Most pros and criticisms of the Guard still apply. The most common use for her is stacking her shields to tank AoE shots (like Typhon lasers), but otherwise, ehhh.

Unlike the basic Dragoon, this one has an infinite (until shot at) duration shield that replenishes itself at regular intervals. She also has higher stats than the basic version, and the 2nd skill reduces enemy stats.

Basically, if your enemies ignore Armor making AEGIS unsuitable for your frontline, these might work out better. SWAP Rippers are broken, but sometimes these will last longer depending on the specific fight you're gearing up for.