I use it to follow water, electricity and gas consumption in France. If you regularly plug your data in, which is really easy to do, the app gives you a graphic view of what is happening. And its enabled us to reduce our general consumption of electricity and gas and in particular our water bill - we discovered we had small but costly leak on our swimming pool equipped with an automatic water leveller. Recent improvements include Dropbox backup which is great. I hope that future developments will enable the data to be stocked on iCloud or similar system that would make it possible to consult, backup and add new data from several sources : I have an iPhone and iPad. To resume, a great App.