interesting but a bit meh. 24mm is cool. slow aperture and no IS is less cool.
Then there's also ACDSee Pro (now in new v5.0), which has the amazingly effective "Advanced Lighting" feature (formerly called "Light EQ"), which allows extremely powerful, flexible, AND intuitive manipulation of light levels in the image - from minor shadow pushing and highlight supression to full-scale single-image HDR toning. It's a truly unique feature not available in any of the Big Ones (LR, PS, AP, C1, etc.).
Disclaimer: No, I don't work for ACDSee. Yes, I'm a very happy user since v2.0.