I'm not adventurous enough to load the beta on my phone, but I did put it on my M1 11" iPad Pro.
Visually, it's both bolder and a bit tackier. I can't say that I particularly like or dislike the redesign. It is what it is.
I did experience a couple bugs, the most noticeable one is the hesitation / momentary hangup when swiping from the Home Screen to App Library. It doesn't happen when I make a longer swipe all the way to the edge, which makes me think this is not related to the performance of older hardware, but rather the OS getting confused for a second when doing a shorter swipe.
The performance so far seems the same. The battery life is similar? Too early to tell.
Some changes are nice - e.g. the Preview app. The ability to export Notes as markdown files could be useful, although it's held back by not being able to export them in bulk. Or at least I don't see a way to do that. Perhaps via Shorcuts?
The biggest thing is window multitasking and I have no opinion on that so far. I need to play with it a lot more. I wish they kept the old features as well (slide over and split screen).