Thanks for that, Brad. This is one of the solutions I toyed around with, but couldn't get a comfort level with. IIRC, when trying to mirror with sound, I was prompted to download another app. Ultimately, I got it to work, but the experience was a bit clunky.

I guess I will tell the client he has two options. Either try this out knowing that it's beta-ish, or else go for the Apple TV.

The one minor concern I have is that adding an iffy app to his iPhone and channel to Roku might destabilize his phone and/or Roku. However, I've never seen an iPhone misbehave in a way that couldn't be easily cleaned up and I imagine the same is true for a Roku channel.