Same day shipping is not that hard to handle if you only sell what you hae in stock ready to ship. It is same day arrival that we all dream of, like we get with shops. With that shipping the same day is fine as long as it gets to the user quicker, they don't care if you shop the next day as long as it arrives the same. With that it is worth noting that shopping the same day just means it got processed and into collection and even then they could have hourly trucks and count that as dispatched.

Now as long as they provide a tracking number(AWB) or the like you can see the progress with, then that does help greatly. If you can even have GPS tracking the last part and notification when hour away or within 5 minutes, well that would be great.

So that is why I don't get too excited about same day shipping. It is the hubs inbetween and there cut-off times that divide up the day so you could ship at 11pm and miss the 10pm cutoff for the hub transit and have to wait until the next one at 10am. In that case for you it makes no difference if 11pm or 9am. Though anybody who has had tracking information will know how weird some routes can be and wonder why they sit for almost half a day at some locations. Then there are customs if different countries are involved and more fun.

For me better item tracking would win over same day dispatch. I'd take a 5 day delivery window over a 1 day one if it meant I could refine the delivery time to a hour and not AM/PM. Though that may just be me.