No screen is great. Should have an internal and/or remote sensor jack so that we can use indoors/outdoors/fridge/freezer/BBQ and hto tubs/pools (not that I have either). Simple.
I would like the ability to have a sensor (pick) I could put throughout the house and be able to set the unit to work off of them on a schedule.
No screen, keep it small. I plan to use them to set up alerts and triggers so screen would be superfluous.