Student easily understand maths concept through 3D animation.
i found the website link : http://www.designmate.com/video_designmate_maths.html
Liked the experimental way the value of Pi and the formula for the circumference was approximated as the best way to introduce the concept.
Not enough demos to illustrate the product correctly.
Never, never, ever, cripple any product in any way for your demo. That ugly watermark, smack dab in the middle, interferes and ruins the vids. I or anyone I know never purchases a product that we cannot see in it's entirety first. Crippled software aggravates the heck out of me. Do a time trial on a limited number (more than 2) vids, no ugly, distracting watermarks.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
It would Be nice to Have to something like that on here.