l-r: NARS Orgasm, Hourglass Diffused Heat, NARS Deep Throat, theBalm FratBoy
I'm of the view that the single most important factor in ensuring satisfaction with these Ambient Lighting Blushes is picking the right shade that best suits your blush preferences and skin tone, since the application takes care of itself and the quality seems uniform across the board. They definitely have good colour payoff, but I don't find Diffused Heat ultra pigmented (which is a good thing), especially if you use a fluffy brush like the Real Techniques Blush Brush or Multi Task Brush. The inbuilt highlighter works to soften and add dimension to the coral/pink pigment so it's not just a block colour.
Predictably, I have several very similar shades in my blush collection. I guess I just can't stay away from my brightening coral/peachy pinks. I was actually more surprised that NARS Orgasm and Deep Throat aren't as similar to Diffused Heat as I'd anticipated, in that both are lighter and noticeably more shimmery, Orgasm more than Deep Throat. I thought Diffused Heat would have a comparable amount of shimmer, but it doesn't have the same characteristic golden, glowy sheen of Orgasm and Deep Throat. It's closer in colour to theBalm FratBoy, though FratBoy is slightly redder, darker and earthier in tone, with a more powdery texture and matte finish.
As most reviews have pointed out, the texture of the Ambient Lighting Blush is very close to the Ambient Lighting Powders: soft, bordering on a touch powdery, and incredibly smooth. It's a breeze to pick up pigment with your brush and blending on the skin is effortless. I've found the lasting power to be better than average, though not as good as NARS. If anything, as much as I've enjoyed Diffused Heat since I purchased it, and I'm truly impressed with how foolproof it is to apply, this whole frenzy with the Ambient Lighting Blushes has reinforced my love for NARS blushes. They might lack the eye-catching marbleisation of the Hourglass, but I feel they are the superior product, and prettier in action.