I have shelves similar to what you posted you were thinking of, and honestly, I don't like them much. They do the job, and they aren't so cheap as to fall apart right away, but they just aren't that nice. If they were cheaper, I'd probably be okay with it, but I feel like I paid too much for what I ended up with, and I kind of hate the way they look.
In general, for inexpensive furniture that holds up, I am always
happier when I go the IKEA route. With cube storage, for instance, I have one of these:(ClosetMaid Cubeicals® 8 Cube Organizer - currently $66.99 at Target)
I have it on its side (so it's 2 cubes high and 4 cubes long), and it's okay. But the cubes are a little too small to store things well, it's too short to work well as a surface (but if I stood it up the other way I'd be worry about it tipping over), and honestly, it just looks cheap. I've had it for 5 or 6 years, and it's held up well enough, but I've disliked it for a long time.
More recently, I bought this:(Expedit shelving unit - currently $69.99 at IKEA)
I also have this one on its side, but since the cubes are bigger, they hold more and the whole thing is taller. The Expedit is about the height of a standard table or desk, which makes it a much more useful surface (at least for an adult). It also looks about a million times nicer than the ClosetMaid shelf I have.
In terms of price, I think the ClosetMaid shelf was a little cheaper when I bought it (more like $50), and I got the Expedit on sale when it was an IKEA Family special one month (so I think I paid $60 instead of $70). IKEA is much harder for me to get to than Target, but I am just so over buying furniture at Target. Most of it seems okay or even nice in theory, but I get it home and it's hard to put together, it doesn't look nice, and it often wears out far sooner than I think the price warrants. I don't think my IKEA furniture will last forever, but it's held up well so far and I'm still happy with it.
IKEA does also sell storage furniture intended for children - their Trofast and Stuva lines are the two that come to mind, but there may be others.
Basically, even though I have to drive 2 hours to get to IKEA and then schlep things back in my Honda Civic, I generally find it to be a worthwhile undertaking because I'm much happier with the furniture I get there than anything I've ever purchased locally.