According to the reviewer, the Bowflex home gym lets you meet the guidelines of the American College of Sports Medicine - particularly if you use a model with the SpiraFlex system.
But for most exercisers, "Bowflex Home Gyms will probably not result in the impressive physiques you see in Bowflex’s advertisements. Nor are they the best workout for competitive athletes."
While it may be a little disappointing, I completely disagree with them, at least it doesn't say don't use it, because it's a waste of time :) I honestly that the system below, the X3 system can be used with Bowflex.