Thanks for the info. I have started my own review of the Dasp mini. Seen posted below :)
https://www.backyardchickens.com/t/777054/diary-of-my-doomed-from-the-start-incubation#post_11112877
What was the ratio of duds to the ones that had detached air cells? We're the ones that developed any of those eggs or were they the ones with an in tact air cell?