I originally wrote the app for my own use, so needless to say I like it and it meets my needs. But you are probably more interested in what others have to say.
We have gotten some very favorable reviews on itunes (http://itunes.apple.com/us/app/sousvide-dash/id476999798?mt=8) including one from a user who bought an iPhone just to run the app. There has also been a fair bit of discussion of the app on the big sous vide thread at eGullet () and in a separate dedicated thread ()
We are always looking to improve the app, so if you have comments, questions, or feedback, we are always happy to hear them. You can reach us here, on eGullet, on twitter at @SousVideDash, or on our own web site. Some of the more popular features of the app, including pathogen reduction calculation, came from user suggestions.
Next on the docket for upcoming release(s), we'll support chilling calculations in ice baths and probably some longer cooking techniques for tenderness.