Love it! Very innovative...I love the simple interface!
I think this is an excellent app with a huge amount of potential. I'm someone who uses mathematics each day as part of my job and what surprised me most when having a go of this app was that I'd start trying mathematical things that I think would not have occurred to me if using pen and paper! I believe the reason for this is the huge amount of intuitive interactivity with the math. I think this would be a very good tool for someone learning algebra. It seems the app won't let you do some mathematical incorrect with your equations but you can explore all the correct possibilities and pretty easily go back a couple of steps if you're confused about where you ended up.