Anyone else making the move from Saxon to TT? I have heard polarized opinions. Some say TT has saved their homeschool from disintegration. Others chide it for not being rigorous enough. My daughters are tired of Saxon, and they REALLY like the colorful user interface of TT. I like the fact that I don't have to work out every problem they miss with them. Nonetheless, I don't want to give them a substandard math education.