I recently started using this app, and so far havent had problems with data lost. And to this matter, I think that the automatic backup to Dropbox can be an assurance.
Although Im enjoying the app, and its serving me well so far (specially remembering the address of my favorite gas stations), it still needs some user interface polishing.
One example its the terminology still much oriented to the dreaded Imperial measurements.
Other thing are the fonts: a better font which allows better contrast and more readability would be better.
So far, Im enjoying and recommend this app.
kaarlows about RememberTheOil - Car Maintenance