iPad M1, 13Pro and 14, all seem to work fine. On my 13 pro I experienced a tad bit more of battery drain when on 18.3 than on earlier iOS 18 versions, not much difference but a little bit. Hopefully 18.3.1 won't be worse or might restore how it used to be with earlier verisons.
But havin said that, its such a small difference so it could be that I have a slightly different usage pattern, using more cellular than usual.
When reading most posts it seems like its iPhone 15 and above that has issues.