been try playing for around 1 week plus using VPN so far so good,
but after checking tier list from JP and KR it seem global unit have some changes.
beside that gacha seem very hard though only 2 percent got get SSR
current stuck at last guide mission and from reddit they said global guide mission reward is nerf as well

yes, it's bad compared to JP or KR the rate is more than double, it's 5% compare to global only 2% and guide mission reward is nerf as well
but on gacha sometimes it's really on your luck even got 5% rate some people might still complaint hard to get SSR
beside that there's some stages give SSR once you clear it for the first time.

but you can accumulate repeat crystal on few source trek mission, daily/weekly/monthly quest, and arena