The Wi-Fi only Xoom is the same basic product as the CDMA/3G version. It's the same size, offers the same functionality and runs the same software.
What's different about the Wi-Fi only Xoom is that, well, it's Wi-Fi only. This means there is no on-board cellular data capabilities to keep you connected when outside of a Wi-Fi zone.
For a more complete review of this tablet, please visit our Motorola Xoom (CDMA) page.