Mostly the usual battery/heat issues, the frequent app crashes (1st and 3rd) and the annoying hidden keyboard bugs that lasted through several public beta releases that required force quitting and restarting apps before it would show up again.
Rather than re-hash, /r/iosbeta is a good indicated of the tribulations of each release.
I was on the developer beta from day 1, then switched to the public beta when that opened up. I haven't encountered any bugs significant enough that I remember details about them.
I'm not saying it was bugfree, just that the apps I use most were in decent shape from the start. (But I still acknowledge that you or anyone else might've had a very different experience from mine.)
Mostly the usual battery/heat issues, the frequent app crashes (1st and 3rd) and the annoying hidden keyboard bugs that lasted through several public beta releases that required force quitting and restarting apps before it would show up again.
Rather than re-hash, /r/iosbeta is a good indicated of the tribulations of each release.
https://old.reddit.com/r/iOSBeta/top/?sort=top&t=month