So we should start with the cream product which is the one I've used most. For me if I had to choose I'd always want cream over powder. This is purely personal preference and this palette is popular despite only 1 of the 4 highlighters being cream. A lot of the reviews are from people who prefer powders. It is what it is. They say you can use this on the body. Again I would prefer to use a liquid - I still have a tin of Bettina from Benefit which I use if I need to (and remember).
The cream highlighter, Eclipse, and it's on the top left of the palette. It's a very pretty pale purple colour which, in my opinion, is lovely used as a base for the eyes but is also the most subtle of the 4 to use on the cheeks. It is unlikely to last all day unless you don't touch your face or speak on the phone at all. But it doesn't last all day on me - but it's great for going out for drinks in the evening.
The first of the baked highlighters is the purple one on the top right of this palette, Hemisphere. This looks incredibly bright in the pan but much more subtle once you start using it. This is pretty on the inner corners of the eyes and the tops of the cheek bones.
Subsolar is a sheer pale shimmer, this will be too pale for darker skin tones except on the eyes. If I was going to use a highlighter (from this palette) on my collar bones and decollete this would be the one. As the finest it would be the most subtle. This is also the one that works best under the brows.
The last is a tan/peach colour baked highlighter, Equinox. Another which may look a bit full on in the palette but is really pretty when used right. This is my favourite to use on the inside corner of the eyes - noticable but not to full-on.
With all the powders a little goes a really long way. Use too much and you will look like you were in an explosion at a glitter factory. Which may be the look you are going for but for me I want highlighter to look more natural. As with all make-up you can build this - there's no need to go in all guns blazing as you can't blend it out so easily.
Just so you know a couple of things I've seen that I disagree with. 1) The packaging is not rose gold. It's gold. As you can see. 2) This doesn't give you a 'lit from within glow'. It's much too shimmery for that. If you want that then I've yet to find an affordable dupe for Hourglass Ambient Lighting Powders.
What You Need to Know - Sleek Makeup Solstice Highlighting Palette