Does exactly what it sets out to do and does it very well. If you are doing anything with CoreMotion or CoreLocation you need this app. We were able to get logged data into our prototype quick and easy using the data from this app.
My only concern is how to deal with log files that grow to file sizes that exceed the maximum supported by email. I havent run into this yet but Im keeping it in mind. Integration with the DropBox app might be a good solution to that problem.
matheeeny about SensorLog