These are pedals only, so be certain if you order this that you have the Sealect Designs rails for the pedals to mount on. Otherwise, they will not fit. In this case, you want to order the Complete Angled Footbrace Upgrade w/ Rails.
These pedals change your ergonomics in a positive way- allowing for your legs to project out straighter and more comfortably. This also has the benefit of clearing your knees from paddle strokes. This is definitely an upgrade worth purchasing!!