Wonder whether should i get this pair of ear phones? Active Noise Cancelling at 39SGD which is quite cheap.

I usually travel via MRT (Or the subway/underground) and on the bus, and so sometimes i crank the volume really loud because of the ambient noise (train moving, traffic). And i wonder how good these are at canceling out these ambient noise.

At Amazon out of 27 ,9 gives 5 stars, 10 4Stars, 5 3stars, 1 2stars and 2 1Stars.

I did some research and found out how active noise canceling works, basically besides a speaker, they have a microphone on the headset which listens to external sounds and the ciruitry generates a 180 degree out of phase signal that cancels it.

Seems like these ear phones are worth a shot.

Link
Creative Store
PC Mag Review In the page there is a link to a webcast where they talked about the various noise cancelling headphones on the market
Good Gear Guide
How stuff works - Noise Cancelling Headphones