Oof, they introduce their own problems, though. Not the least of which is data loss due to weather conditions and twitchy software. One contract I collected all my field data on Rite-In-The-Rain because the FDR's we were given had terrible screens, terrible battery life, and crashed every few minutes. It was better to hand-transcribe the field notes in the office, and hand in both digital and paper data at contract's end.