Regarding the WRI™, I only use the power meter after the effort. You don't need a power meter to tell you how to pedal as hard as absolutely possible fore every single pedal stroke for a minute
Before I had a PowerTap, I didn't know I should be doing them that way (I used to pace it really high). So, the PT exposed my lower than expected 1m power, and experimentation figured out why. Seriously, I don't have any use for the PT until I get back to download data for 1m interval workouts.