This is a nice-looking shelf at a very reasonable price. I purchased the honey-colored shelf, made of pine. Here are a few details that might help in your decision (details I've been unable to find anywhere):

The shelf is very light, and light-duty - hollow construction of thin wood, with some internal strut(s) for rigidity. Don't mistake it for a bookshelf!

The mounting bracket is a length of 2x2 with pre-drilled holes every 4: you attach the 2x2 to the wall, slide the back edges of the shelf over the 2x2, and screw it down through screw holes at the back of the shelf top. The 2x2 is shorter than the shelf (about 3' long for the 4' shelf), so you can place it to take advantage of studs, then position the shelf exactly where you want it before screwing it down.

I'm not accustomed to shelves this light - check back with me in a year to see how they're holding up. But I think they'll be great as display shelves.