Giant bikes use an integrated headset. I have a Giant AC with CK "Perdido" integrated compatible headset. It improves the steering reliability and durability, but it doesn't really "strengthen" the bike very much.
You can't use a regular headset on the Giant, and I wouldn't spend the money on one a second time. If you want a CK headset & want it to matter, buy a better bike that doesn't use an integrated headset.
I also have a Moots Ti Rigormootis with a CK & it's a sweet setup. Here, it matters.