It is a mining service geared specifically towards the Chinese mining community, with a focus on bitcoin and ethereum. It's a safe service supported by a huge group of miners that control a significant portion of bitcoin's mining power.
What's more appealing is the payout procedure, which takes place the next day once the minimum withdrawal is met.
In general, this mining pool has received mixed reviews regarding security and payments to members; nevertheless, it is worth noting that, despite the negative reviews, it has a high mining power when compared to the market average which is one the good points of this pool.