I recently bought a Shield for streaming because of all the good things I have read about it. I wish I hadn't. For my purposes, it is just an expensive paperweight. It is not compatible with most of the apps that were working on my cheap Chinese box. I keep discovering things it can't do instead of things it can do. I'm sure it is great for gaming and other things, but for streaming it doesn't do what I need. I have a $30 Chinese box that works better. I am very disappointed in it and I would not recommend it for this purpose. If all you want to do is run Kodi on it that might be okay, and Plex should also work, but many apps from the Google Store don't work and there are other things it can't seem to do that the cheap one can. It doesn't seem very flexible to me. You may be better off with something else.
Shame it hasn't worked out for you.
Happy to take off your hands if the price is right.