Whoa that sounds like a hassle to turn on the visor. Rich Eso just made a video of Gigan and compares both 25cm and 30cm together. Most notable was the head sculpt, the 25cm looked meaner and the top horn is curved forward rather than the 30cm which is kinda straight up with a slight curve forward. Both have their differences.
At least I got him, I been searching for a deal on Gigan for 2 years