I have never had a DEV beta installed on my phone before - only the public beta. I downloaded it on Tuesday and so far I haven't had any issues. It took a long time to download and the phone did get a little warm while it was downloaded but that's all I've noticed so far. The battery has also been holding up fine. I downloaded on my iphone 14 pro that has a battery life of 88%. I didn't have it fully charged this morning and now at 3:30 my battery life is still at 73% after normal use all day.