I was originally going to wait until the final release. But I found a good deal on a 64GB Wi-Fi only 6th Generation iPad mini that, in light of already owning a 256GB Wi-Fi+Cellular 6th Generation iPad mini that I use more extensively, I decided to use for testing betas and MDM solutions. Suffice it to say, the 64GB Wi-Fi only model is now running the third iPadOS 18 Developer Beta (which is effectively the same OS as the first iPadOS 18 Public beta).Personally, I’m going to wait for the final release.
What about you?
I won't ever use a primary device of any platform for betas. But if I happen to have a lower-end spare of a given model that I already own (or an older iPad in general), I'll totally use it for betas!