There’s nothing bad about the hydrating part. But when it comes to long term usage, theres not much in the change of the skin condition such as brightening. 
But it makes a good serum for hydration.

They just recently came out with the 4th edition of this serum. 
Its more watery than the 3rd edition which allows it to enter the skin and hydrate even more quickly without clogging pores. 
It helps my skin feel refreshed right after cleansing and is a super good serum.

The only downside is that its not reccommended to be used every day, I used it for 4 days without breaks and resulted in a bit blackheads, then when I stopped and gave breaks in between it became normal again!

Its super super hydrating! In fact it leaves your skin glowy in the morning when you wake up! 
My combination skin type doesnt find it clogging pores too! So its reccommended for all skin types. 
It has a cooling sensation when applied onto the skin and has a jelly-gel like texture to it! But also doesnt clog pores and create a lot of white&#47;black heads

Jiaaaxuuuaan