I know its little too early to give an opinion about Manhattan card.
But there are some new features that interested me to go for this one.
First, this is life time free credit card, that means no annual fee for life. This was a good offer and almost all the credit card companies like citibank etc. immediately came up with the same offer.
Secondly, according to your usage they can give you better interest rates. Still I am not very clear about this, but some thing new.
But there are some major drawbacks also which anyone should think of.
First one is that, this is offered by standard chartered bank, known for its bad to worse customer service.
You can check the users opinions in mouthshut itself to understand more about this.
Secondly, there is currently no system for payment through internet like that of citibank or icici.
Finally, you will not find any drop boxes separately for Manhattan card. you are supposed to drop them in the boxes written as for standard chartered credit cards.
I should mention here the unique communication style of Manhattan statements and letters. They use a very informal way of communication which I found very interesting.
So far no problems with this. Let us see further.