MattKing pointed out the paper intended for electronic exposure may be susceptible to reciprocity failure. You probably won't encounter that paper. I was thinking of getting some, so it might pertain to me one day.
If I understand, with an Omega 4x5 enlarger and normal paper, you will not encounter reciprocity failure. Even if you did, the practice of making test strips completely negates the impact - because you would be testing the actual results you get for the actual times you expose.