I love the multipurpose brush, I think it's exactly all the tools I wish was combined into one when I'm traveling / post-gym workout. I also like their qtips with makeup remover for emergencies. The cream eyeshadow stick is great but isn't really a differentiated multi-tasker product from other makeup brands that have eyeshadow sticks.
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I don't like how not environmentally friendly their qtips product is so I try to use very sparingly. I think the usefulness of their other products is very dependent on your makeup routine. The multi stack assumes that I use bronzer & highlighter & blush all the time which I don't so it's not as useful. Same with the lip trio, when have I ever wanted the same color in 3 types of finishes all at once when I'm trying to travel light?