I found the following review comparing the Onkyo to the Bluesound Node 2i.
I've been looking around for the last few months for a new streamer myself. at the $800 price point, with your wish list, it's really hard to beat the Powernode 2i. I only have two problems with it: support by email only and I wish it had some type of room correction.
I really like the NAD M10 streamer, but at $2500, it's more than three times the price of the PowerNode 2i.
Full disclosure, I've never heard the Onkyo unit.
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The Onkyo TX-8250 is a basic, straightforward music streamer at an affordable price. No more, no less. It gives you all the features you'd expect, the ability to control them, and then gets out of the way. The lack of digital album art, Roon capability, and the like are reflected in the price. For the most part, the TX-8250 was just designed to get the job done.
The problem is, while it is a very solid streamer in its own right, and certainly a viable option, it pales in comparison to the excellent (and less expensive) Bluesound Node 2i. We struggle to imagine getting the basic Onkyo, with its average sound and dated design, over the exciting, dynamic Bluesound. We don't mean to shortchange Onkyo – their streamer does have features that the Bluesound doesn't, like a digital display, and there are some solid options for the price. But it's never going to be anything other than a reputable alternative to the more interesting models on this list.