I have come across many contests. In The Hindu, newspaper, they have many contests, but even if you participate in it for 100 times, you never stand a chance of getting through. Many magazines, online sites conduct contests. But participating is of no use. But I think mouthshut is different. If you participate winning is sure. That is what I heard from my friends.
I started participating in this, after I received sms from my friends. They all have participated and won the contest. They vouch that, there is full transparency and honesty in this contest. Anyway, I think mouthshut is being a good social platform where anyone can review a product and get to know about a product with honest opinions.