I don't even understand the pitch? you have the disc playing, in your hands, your ownership, no buffering, no subscription required. and they're saying....hey do you want a worse experience?
When I tested a roku (I think that's what this is, based on the button and color) stick a few years ago, it was awful - network errors during setup, atrocious password limits, and once I completed setup it had a ad that took 1/4 of the home page and it wouldn't calm the fuck down pinging servers even when idle. I actually returned it the next day, I wanted my like $40 back.
My ex bought one a couple years later and I cringed so hard. No way in fuck I'd let that infestation on my network again.
Oh, more of a "I thought you loved me" and a dash of "I didn't sign up for this" after I had a stroke. Love is cheap to some... sometimes the one closest to you.
Never used the Roku stick, but I used their high end wired Internet model for a long time and it was great for what it was. I haven't tried any of the stick devices because I always questioned the performance they would have.