Earlier this month i changed from 1 day to 3 days (and lost my premium seller badge)

My sales took a nose dive and i was well below average for that week

As soon as a changed back to 1 day and got my badge back my sales picked up and went back to where they were before

so i concluded

1) it was a coincidence. 1 week isnt a proper test period but i didnt want to go a month and have terrible sales

2) extending handling times turned people off because they didnt see "fast and free" and my premium badge

3) handling times make a difference in my category

To this point since the Jan 4 changes i have not had 1 person complain about postage taking too long. All my feedbacks make mention of how quick postage was, so i have no need at this point to worry about my handling time of 1 business day (and im not using the priority labels.. all my sales are large letters)

I'll worry about handling times again if it becomes a problem