I haven't tried bare minerals yet. Right now, I use Sheer Cover and I love it. I chose this one over Bare Minerals, because Sheer Cover comes with a concealer cream. I love the concealer cream and I'm going to order more later. It doesn't make me break out, which is so important. I can't wear liquids. I use their primer and finishing powder which I think makes all the difference. It's ashame how the Sheer Cover people do not include it in their starter kit. Thats how they lose customers. As for coverage, I have scars on my right cheek, so I use more concealer cream, which works wonders for me. I do not use enough that it's completey gone, but nobody really looks that close up to my skin anyways. I'm pretty happy with Sheer Cover. I know not a lot of people are fans. I have struggled with acne throughout my life and my skin has not been angered. If you apply it right, it will look great.
I posted a very unpopular thread on this, maybe you will find it a little helpful.
(ext) specktra.net/f265/bare-minerals-vs-sheer-cover-i-use-sheer-cover-but-how-does-compare-ti-b-e-86384/Sheer Cover is pretty cheap to try. $40 USD will get you their starter kit. I like their mascara that comes with the kit lol... maybe I'll order another...