Does the Orbi have ethernet backhaul?

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Reagten wrote:

Do access points allow seamless hand off from one AP to another?

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Leaving enterprise gear out of the discussion, keep in mind that hand off is generally decided by the device, not by the access point. AFAIK, even the Orbi won't initiate hand off of a device between satellites.

Whether or not the hand off is seamless really depends on the aggressiveness of the device's roaming algorithm. Most smartphones are not aggressive; they are very sticky. This often results in a poor handoff experience.

The hand off experience will also depend on the placement of the access points. Place them too closely and a device may not roam.  Too far apart and there will be dead spots.  I've seen recommendations in some enterprise guides for 15%-20% overlap between Wi-Fi cells, where the edge of each cell is -67 dBm.

Some consumer grade access points are now starting to support the trio of protocols, 802.11r/k/v, to facilitate fast BSS transition (aka fast roaming) but these are really designed to combat the high costs of hand off in an enterprise setting. In a home environment, they may not offer much or any improvement. In addition, a few brands do offer a minimum RSSI setting that will kick a device off in order to force it to roam. But this can hardly be considered a seamless hand off!