Having used ODK for over three years, nothing is as efficient & effective as having all your data collected paperless (lets continue to save the environment). Moreover, additional functions such as calculate, restraints, skips, repeat groups, GIS, among others are fascinating. I spend most of my time supporting project M&E functions, and ODK is one of the few wonders of the world. Significantly, ODK has improved surveys data management especially- data acquisition costs, timeliness, security and quality. Of-course, I am cognizant that the continuous changes, and a more interactive interface would take it to the next level . Overall, having this free of charge for basic use is exceptional.