I was a little concerned that the novelty of a giant chalkboard wall may wear off quickly and the kids would lose interest. So far that is not the case. The chalkboard is a hit and has made Ella's unfinished room the house hang-out spot. The only downfall is that I am constantly cleaning up chalk dust. I need to order those chalkboard markers I heard about.
I had considered doing the chalkboard in charcoal gray. You can make your own chalkboard paint in any color by mixing 1 cup latex paint and 2 tbs. grout. However, I since I've always wanted to paint a wall in my house black, this was the perfect opportunity. No regrets. I love how it looks when it's clean solid black. I especially love how it looks with chalk dust and colorful doodles.
UPDATE: I found Dustless Chalk at Staples. I'm happy to say that it really is dustless. The best part is it was less than a dollar for a whole box! I'm going to skip the markers for now.