Yep. Great stuff. Two of my homeschooling kids (4th grade, 2nd grade) use it as part of their math programming. We also enjoy just "surfing" around for some neat content.
I passed the DSST stats exam using only Khan vids. I also assign corresponding Khan vids to my kids for various science/math lessons. I will say that I'm not super excited about his "expansion" into the non-STEM stuff, but it is what it is. Big fan.