Bios overclocking will always be better than software. Period.
As for the program, idk, i see alot of people just using it as a type of cpuz, but im sure some novice clockers use it to experiment then go into bios and set the options in there themselfs.
for a noob overdrives decent.. for the rest of us [H]ardcore overclockers.. its useless.. it is good for testing to find your max overclock at a certain voltage.. but TAKES FOR EVER!!!!.. it has some other good vital's information on voltages to each core/temps crap like that.. but it could be better then it is..