A set top box is not required but is an option.
You have the choice to stream only through one of the supported devices or using a leased set top box from Spectrum, or using both methods.
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That link Boz, is for internal use, as it has codes for the billing systems. The one I posted is meant for customers, and shows more detail on local channels
If you do want to go with TV Choice, then call into Sales, or visit an agent in a Spectrum Store. I am not aware of a web portal for ordering.
As for an answer to what Satch questioned about the premiums....they are the same offerings as with the standard premium lineup. You get all the HBOs + OnDemand + TV Everywhere app, not just one or so.
TV Choice is available across all the footprint to those that are subscribed to internet only. The selection of 10 channels from the list of 65 does not have any regional variance, that I am aware of. The regional variance is the local (Limited Basic) channels that are part of the package. TV Choice is like the Stream package, as it does not require a receiver to get the channels, and is designed for those that like to use the Spectrum TV app as thier primary interface. It is compatible with the DVRs and receivers.
As for the premium channels, I was under the impression that they received the full range of channels available per the market. For instance, with HBO, you get HBO, HBO 2, HBO Comedy, etc. Plus you get the On Demand, and the TV Everywhere app. Since this is a streaming package, when you have the premiums added, they should show up in the lineup on the app, just as when you have the Silver or Gold package. I can check into this to get a confirmed answer.