For now, however, if you have a model that's not already smart -- or you're not happy with the nature of those smarts -- you can grab a great deal on a sweet streamer.
For a limited time, Amazon is offering the Roku Premiere 4K/HDR for $29.99, which is $10 off the regular price and only $1 more than the price of the non-4K Roku.
This is the newer version of the Premiere, the one that does support HDR. (covers the previous iteration.) That's great if you have a TV that does as well -- though it's hardly essential.
I don't own a TV that does 4K or HDR, but I'm looking at this as an upgrade for a few Rokus that don't offer the Private Listening feature -- something I definitely do covet. If you want voice controls, however, you won't get them here -- not from the remote, anyway. (The Roku app supports voice search.)