I have an old Intuos 3. You need some practice to get used to it, not watching at the pen tip while drawing or writing, but it helps that when you hover the pen, that it is like a mouse movement without the mouse button pressed.
I looked at the specs for the Intuos Draw and seems to be only available in "small" size, with an active area of 152 x 95 mm. This would be too small, at least for me. Before my Wacom tablet I had a noname tablet which was half the size and was no fun using it, because I need some space to draw. My Intuos 3 A5 has 203 x 152 mm active area. The Intuos Art, Medium, looks usable: 216 x 135 mm.
My tablet works fine with SmoothDraw, I just tested it:
SmoothDraw is a nice program, I didn't know it before you mentioned it was used a Khan Academy. As you can see at the end of the video, it supports pressure sensitive drawing, too, thicker lines when you press the pen harder on the tablet. The toolbar can be configured, just drag-and-drop the most used tools from the drop-down menu to it. I replaced "smooth eraser" with "hard eraser". But the back of my pen, usually usable as an eraser, didn't work, but it works in Photoshop. But not a big problem, all tools can be selected with keyboard shortcuts, or click on it with the pen. My setup is Windows 10, 64 bit (in a VM with Linux as host, but this doesn't matter, I just needed to disable VM mouse integration to make the tablet work). But I think Windows 10 has some OS support for tablets, so any other tablet with driver support for it should work, too.
That's me using the same table in Photoshop some years ago. I know, I have no talent, still fun