Absolutely brilliant card. Best in the market right now when paired with Apple Pay to give 20x Citi Dollars, with no cap, and 10x Citi Dollars on a good range of stuff. This is my number 1 card right now, and if you have an iPhone, I highly recommend adding this card into your Apple wallet right now.
If I were to be really fussy, then the only downside is that bonus points are capped at SGD 12k worth of spending per year, and points across all Citi cards don't pool, but that's not a reason for avoiding the card. The benefits hugely outweigh the costs and I strongly recommend this card if you want to gain miles at an unbelievable speed.