The SpiraFlex® system is different from the PowerRod® technology used by the Bowflex® Ultimate or Bowflex® Xtreme because it uses rotary motion instead of linear motion. This provides for consistant resistance instead of progressive resistance.
The Bowflex® Revolution® home gyms use SpiraFlex® resistance plates. The lightweight, interlocking SpiraFlex® plates fit together easily for resistance ranging from 10lbs to 300lbs (upper body) or 600lbs (legs)
The Bowflex® Revolution® System is also more compact, so if you are looking to save some space, this would be an ideal system for you.
