Bro, can I tell you something? Dont order any mass gainer. Seriously, you will regret it. I can help you make a home made weight gainer which will cost half of what you will pay for this imported gainer.
Just make your own homemade weight gainer. Basically the trick to gaining weight is eating more calories than the caloric requirement of your body. You dont need a mass gainer to do that. Also, buying a mass gainer isn't a short cut because one bag would not help you gain any weight. A lot of people cant adjust to mass gainers because of high amount of sugar, protein and carbs together, they get an upset stomach and end up flushing it all down in the toilet.
Not only that, most weight gainers require you to take 4 scoops twice a day. You have to be a crazy **** to take that much. And even if you do manage to intake 8 scoops a day, you'll feel full and won't eat anything.
Dont buy any mass gainer. This is my advice to you and I can guarantee you, you will regret it.
Anyways, if you still choose to buy a mass gainer, the one you posted on your post is one of the best because Optimum nutrition is a well known and well respected company in US.