I am all for lower cost software and the developers are to be applauded for releasing this reasonable emulation of the 41CX at a very reasonable price.
And this release is quite useful if you want to see if you "like" having a 41CX on your iPhone.
Unfortunately if you are serious about using all of the functionality of the 41CX, the current release of this app fails.
At least in my configuration (iPhone 4/iOS 4.3.5) some functions do not execute. E.g., Beep, Tone n, Clock., XYZALM. And Seekpta causes some major memory shifts resulting in a loss of calculator programmed functions.
I have alerted the developers and hopefully they will address these deficiencies.