So here's the deal. First, they're only for Nikon and Canon. Next, the preset turns on the Auto Tone setting in Lightroom and it's just like clicking on Auto at the top of the Develop module panels. However, it also includes some Clarity and Vibrance changes in addition to the edge darkening. That stuff stays the same for ALL of them. What does change is the camera profile that is applied, which is why there's a bunch of Auto presets. They're intended to be used as you're importing your photos into Lightroom. If your particular shoot was a portrait session and you're fond of the Nikon "Camera Portrait" profile then choose the "Auto Enhance - Portrait (Nikon)" preset. If you were on a landscape shoot then try the "Auto Enhance - Landscape (Nikon)" preset or even the vivid one. If you shot a portrait with a great landscape behind it, well, you're outta luck :) Actually, it kind of relies on you at least knowing which profiles you've become fond of because you'll need to decide which to apply on import.