Bought this to replace the standard thermal paste of my Dell laptop, running Sandy Bridge i7 quad core and nVidia GT 540M. Before and after average temperatures for CPU and GPU combined under reasonably controlled conditions are 56C vs. 43C at idle, and 94C vs. 83C at maximum load (running prime95 on 7 threads and FurMark on 1 thread and GPU). Idle and low use temperatures (like browsing the web) means that the fan is off, and combined with my SSD, my laptop now runs entirely silent.
That's a reduction of 11C. What more need I say?
The tube contains a fair amount of paste, enough for at least 4 or 5 applications I guess. I've done a paste replacement twice now, once to replace the standard Dell rubbish, and once again after a month to make sure I did it right the first time (I applied a little too much the first time). Temperatures before and after my second paste job varied only marginally, and could be contributed to ambient temperatures (since I did it over a month later).