Your screens are well organized, you have an excellent balance between "click" and
"type/tab" (because for anyone who can type, typing is LOTS faster than clicking),
you've done an excellent job at automating things that would be senseless repetition
for us (PQRS codes are wonderful!), you have detailed history on the transactions,
you make sure entries are balanced (and love that F4 to calculate the difference),
you have all kinds of reporting capabilities, you "double-check" on selections that
could be potentially dangerous for the user (instead of just doing it!). And that's
just off the top of my head .