@Pankaj: Side sun films are usefull if you travel in the sun with ac. Especially on highways. The heat falling on your hands would be reduced a lot. Garware is a good brand and is rising up the ranks. Do check the prices for Llumar and 3M(they would come in below 3k). All fall in that range. Check for the heat reduction percentage in 50% VLT category in all these three brands.
Front Glass: This is the main area from where the major portion of heat comes. Front glass films does good job even though their VLT is at 70%(at the high price ). Since it is a costly product, I would advice you to drive your friend's car. Say for 50kms in the night(highway preferably) and 50kms in day time(broad sunlight). This will help you reach a decision.
Also, My experience with garware is limited to their basic range(1k wala). They are very good for that price.
BTW prices for Garware are fine. 
Posted by Vasanth
do not stick the sunfilm in the front wind screen fully.
There is in fact no issue in sticking sun films on front fully. Front sun films are different and are costly. They offer better heat reduction compared to the side ones. They do also reduce glare to an extent. Also the 6 inch thing doesn't serve much purpose.
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