Excellent app, great tool for nitrox does US and metric  
By: JMaverick4 - Aug 30, 2009
Version: 1.3
If you which to change unit preferences, goto the iphone main settings and you can switch between to two, might not have been clear to some people that unit settings can be changed. Pretty harsh 1/5 stars from gpmark.

Does exactly what the app claims too do. Great addition to app store.  
By: TimTamR - Aug 30, 2009
Version: 1.3
gpmark missed the mark, the app does do metric and US units, user can switch between the units in the main iphone preferences. This is the best nitrox calculator on the app store.

Simple and Effective  
By: Scuba Instructor - Jun 24, 2009
Version: 1.2
This app is great, it follows the KISS principle, Its simple to use, and does the job.

Thanks for the update  
By: epfreezer33 - Oct 1, 2009
Version: 1.4
I am revising my rating after the most recent update. I eventually found the option in settings to change between meters and feet. It is so much easier having this option within the app itself. Thank you for changing it back. This app is awesome. I never remember the formulas to calc MOD but this makes it simple.

Good App  
By: Rescue Diver - May 1, 2009
Version: 1.01
I would like to see imperial units also!

Sweet little addition for scuba diving - but has fatal flaw  
By: gpmark - Aug 27, 2009
Version: 1.3
One star for anyone not on metric.
The good - does just what is says. Nicely laid out and easy to read. Gives just what you need and no more.
The bad - For a new release not having imperial means this app is coming off my phone. The KISS principal is what makes this app worth while. Not having imperial defeats the KISS principle and can lead to errors - and this is not where you want to make a mistake. Too many other good programs with the same info. If yoy use Metric - use it. If you are in the US, us something else!