Thermal grease is primarily used in the electronics and computer industries to assist a heatsink to draw heat away from a semiconductor component such as an integrated circuit or transistor.

Thermally conductive paste improves the efficiency of a heatsink by filling air gaps that occur when the irregular surface of a heat generating component is pressed against the irregular surface of a heatsink, air being approximately 8000 times less efficient at conducting heat (see Thermal Conductivity) than, for example, aluminium, a common heatsink material. Surface imperfections inherently arise from limitations in manufacturing technology and range in size from visible and tactile flaws such as machining marks or casting irregularities to sub-microscopic ones not visible to the naked eye.

Wikipedia  

Indian market is mostly flooded with Arctic Silver 5. Though there is no official distributor, most of them are imported in bulks. OCZ Ultra 5+ is the best competitor of AS5. Same as AS5, OCZ also doesn't have any official distributor here in India, but still, attractive price of OCZ, lower than AS5, is a sure killer of AS5 if and only if it can give equal or better performance. If it can perform, we are sure that Overclockers like us will not hesitate from directly importing them from online-shops.

After all, OCZ is a very powerful brand name.

Let us start the test. 

Don't get over excited due to its big size. It contains only 3gm. of thermal paste, but should be enough for 10 to 12 applications.

Special thanks to OCZ Technology for providing us the test sample, without it, this review may not be possible due to lack of OCZ distributor/reseller in India.

We surprised to see such a big FedEx box just for a single 3 gm. tube of thermal paste.
Actually, they also included some stickers and a cool OCZ t-shirt which became my official uniform for our local Lan-parties.