So Luna Display came from a random event of recommended media. I have a First Gen iPad Pro, so it is limited with 2GBS of RAM. For the longest time I was considering upgrading to a new device as I was using the same iPad since 2014. The low RAM was getting in the way of doing high resource tasks, majority being digital artwork, so I needed a way to increase my RAM to get the more beefy tasks done. I was considering new devices, and even interactive display tablets for my Desktop as it has 8x more RAM. Although I still wanted something to use on the go. I never considered turning my iPad into an interactive display tablet until this showed up.
This came to be an excellent solution I never considered but works well. I can work on beefy projects on my PC, using the iPad as an interactive monitor that can still use my apple pencil, and use my iPad for smaller projects on the go that need less power.
There is one thing I wish they would include in the packaging of the dongle and possibly on the menus of the app, is an addition on how to get the service to work correctly.
After much trial and error, I found the sequence you want to do to get it working first try is to plug the dongle in or already have it so, open the host device app(see if it wants you to re-plug before continuing), plug in or connect the secondary device to wi-fi, and then open the app on the secondary device. Going outside this order leads to issues and it not setting up correctly. Which if you mess up the order, it is best to just close the apps, disconnect the secondary device, restart the host device, and make sure you get the order right on the next try.
A little card or an addition to the "getting started" card in the box the dongle is shipped in will help a long way. If possible, add an internal help message that doesn't need to go on internet explaining this order inside the apps.