I was looking at the Android Market (Play) and it showed the Rezound as being Verizon, AT&T, and T-Mobile.
You're seeing the rezound and sensation phones..not just the rezound. Same basic phone different carriers/models.
Sent from my Paranoid Android Galaxy Nexus
Are you rooted? Flash tons of roms? Maybe one of your roms made the play store think you had a sensation. Are not some of the ICS roms based on the sensation?