Well, I haven't tried Hourglass' Ambient Lighting Powders, but from what I've gathered is that it's a powder that won't highlight your imperfections (like those that tend to settle in or highlight the pores or look heavy, dull or powdery on the skin) but, it will give your skin a "lit-from-within" sort of glow and give the appearance of softer, younger skin. It also claims to make your skin look great in any lighting situation you are in (bright sunlight, candlelight, etc.) The powder took off pretty well, so Hourglass created a blush with the same concept.
I've had this blush for a few months now, and I've been using it regularly. As a die-hard blush lover, I'm a huge fan of baked blushes because I love the texture of them and how easy they are to blend. This blush is super soft to the touch and blending with it is so simple. Worst case scenario, if you didn't have a blush brush on hand, you can use your fingertips to apply this blush and it wouldn't look like it. It has a nice satin finish that isn't shimmery or frosty. It just gives a slight glow to the skin when the light hits your cheeks.
The lasting power is pretty average for me. I typically never re-apply blush throughout the day, but if I was planning on going out for the night, I would most likely have to reapply this blush mid-day as it fades pretty significantly by the evening.