The Jetstream supports Optical audio, has an Ethernet port, microSD slot and 2 USB 2.0 ports. It is Android TV and Netflix certified. It comes with certified Android 8.1 (Oreo), so you can play 4k videos from Netflix, YouTube, Amazon Prime Video and other streaming apps just fine. However, it is not the most powerful box out there (equal to the Mi Box S in terms of raw power), and it doesn't get updates very often.
I have one and it has been great. It doesn't feel slow (not as fast as a Nvidia Shield, of course). I don't care too much about updates as long as all my streaming apps work fine, but if you care too much about updates, then it's not the best box for you. I believe it has received only one update since it was launched over one year ago. So, up to you.