The Orbi RBK40 Wi-Fi system is the stripped down and more affordable version of the original Orbi RBK50 that came out last year. Its dedicated backhaul Wi-Fi band — one that wirelessly links its two hardware units together — has just half the speed of its older brother’s.

This means the new system has slower Wi-Fi speed compared to the previous model or less coverage, depending on how you want to use it. However, since the RBK50 can be overkill for many homes, the new system actually strikes a balance for those living in a home of 4000 square feet or less, wanting to bring fast broadband speed to every corner.

The RBK40 costs $350 (AU$599, £300) for a set of two units, $50 cheaper than the original Orbi, but more expensive than the similarly-configured Linksys Velop which goes for $300 for two units. Thanks to the its full feature set — which the Velop sorely lacks – the RBK40 can still be a slightly better choice for those with a fast broadband connection.
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https://www.cnet.com/reviews/netgear-orbi-rbk40-tri-band-wifi-system-review/