I took their sunset tour over the Valley of Fire and Grand Canyon. It's certainly on the expensive side (550 USD), but it was up to expectations.
It's difficult to grasp the size of the Grand Canyon until you have descended into it and felt its uncomprehensive vastness from above as well as sheer high wills from within.
The sunset time also provided for excellent light play, wonderful shadows and color as well as a lit nighttime Hoover Dam and Las Vegas city on the flight back.
Recommended!