I have owned and used HP41CV since early 80s and HP41CX since mid 90s. I still use them daily. Had to scrounge everywhere to keep a working model going. Although I would still prefer the feel of a physical machine, this app is absolutely fantastic and I use it all the time. It has performed flawlessly and is great fun since I now can have the calculator at my side to address, or analyze the world around me. It looks good, it works good and its a blast to have such access.
3/2015 Update: OMG! After using this IOS version on my iPad Air 2 for awhile, I am beginning to enjoy the IOS version more than my original HP (I own 3) versions.
EcklarA about i41CX, v7.1.2