I thought I'd share my results of my very limited experiences with this.
First shipped eggs -- turkey eggs of
ebay, received on May 3. I ordered 6, seller sent 9. Eight developed, one was infertile. Of the 8, one died late in the shell, 7 hatched, one was immediately ill, couldn't stand, neck flopped, etc., I tried to save it but it died around 4 or 5 days old. So, I ended up with 6 healthy chicks that were two months old this week.
Second shipped eggs. Button Quail eggs shipped to me in mid-June. Out of 25 eggs, I ended up with 8 hatching, one died. I have 7 now that are a month old this week.
Third shipped eggs. Ordered 50 coturnix eggs, received 55, one broken and I broke a couple more in handling them. I pulled out 22 clear ones/rotten ones at lockdown. I ended up with 9 hatching, and probably close to that many that died in the shell at the end.
Fourth shipped eggs. Button Quail. 30 received on 07/13. I've had 9 hatch so far, and a couple more are pipped. It's late, like 21 days today, but I hope the last few make it. I broke 3 of them in handling. I hope a couple of the rest still hatch, I'll give them until tomorrow.