Is this a good workout?

is the 300 workout good? and how often should i do it? for those who dont know what the 300 workout is, its the workout the guys from the movie 300 did. im not sure if i should start do it like once a week in addition to my normal 5 day a week regimen or if i should replace my current routine with the new one. if any of you have done it, did it work?