For a normal time calculator it works just fine.
But quite often I need to add the same number to others and there's memory function. This gets annoying.
Also, after adding up some numbers I hit = to see my total. Then, normally you'd expect to start a new calculation when you start typing again. Unfortunately that's not the case, it keeps adding to the previous numbers. You have to start over with AC.
And then that message that you have rate or write a review ... every few minutes it comes bothering you (me anyway)
For something this simple I had to pay, so I'm expecting less annoyances.
