I start the p90x workout a few week ago and begin use the rubber resistance band . however , when I switch to this set of weight the workout become much more challenging . I highly recommend these over the band if possible . change weight be a snap so you can easily keep up with the video . the product feel solid and high quality . yes , there be a price premium for the Powerblocks but they be much quicker than change plate weight and they take up much less room than a set of dumbbell . highly recommend . no offense to Amazon , but due to ship cost , try to buy they locally if you can . I pay $ 269 + tax for the Sport 5.0 set which cover 5-50 pound in 5 pound increment . unless you be a bodybuilder , this weight will cover all the exercise in p90x . and the Sport series can be upgrade to 65 pound if you really must have it .