It is a dependable product that, if used correctly, will not hurt your machine. But if you hate to see your CPU crank away at 100% for hours on end just to see if it is stable after an O/C tweak... try Intel Burn Test. It will determine in a short time if you have a bad O/C. http://www.majorgeeks.com/IntelBurnTest_d5987.html
cheech congrats on a very balanced rig. Like the fact that nothing's overdone. Especially the psu.
To your question: Prime 95 won't burn your system up. Your mobo (Thermal throttling option, default enabled in BIOS I believe) and cpu both have overheat protection and you should not worry about Prime damaging your system in anyway.
Like Clutch and Envy said, Prime makes more sense to those who want to test the stability of an Overclock but you can just as well run it for fun and see if your HSF installation is proper. but remember, gaming load temps will likely be lower than Prime.