Thanks Brian,
Here's the Demo I'm talking about.
E413: https://www.youtube.com/watch?v=7ndP8d4gWBc
E423: https://www.youtube.com/watch?v=tYOi4murCRU
more E423: https://www.youtube.com/watch?v=ySqlY8zfMvE
They seem very much alike to me. But the new E423 has more memory, more features are enhanced and it's 2 years newer. I think for the $40.00 more the E423 is worth it. I think it's a step up for sure.

Thanks for the further info, Wayne,