well, here was my experience, trying out flexisheet:

download flexisheet... fire it up... do a 'file open' on a simple CSV text file... watch beachball cursor spinning... and spinning... and spinning... while a message displays "opening file" [or words to that effect]. after ten minutes begin trying the usual keyboard commands like "apple+ ." and "esc" to try and force the app to abort what it's doing... app continues to display spinning beachball... hit "apple+alt+esc" to bring up force quit window... force quit flexisheet

at this point i think "OK. maybe it didn't like that CSV file for some reason. i'll give it a fair crack of the whip. so i:

navigate to the flexisheet app folder and select one of the "sample files" therein... double click on the sample file... get presented with an error message saying "loading this document failed. this document is in an invalid format"... quit flexisheet... move flexisheet to trash... empty trash... think to myself sadly "there's 15 minutes i'll never get back!"