Good battery life, simple to use, and offline recording all major pluses.
I've found the SensorMojo very useful for a couple things around the house:
1) My heat was very unbalanced, and it was helpful to be able to quantify the temperature difference in various rooms as I made adjustments.
2) My bonsai trees weren't very happy this winter, and discovering how low the temperature in the window where they live was getting made me realize they needed a space heater. The humidity monitoring was then essential to ensure they didn't get too dry while staying warm. They are very grateful!