I love the iPhone 13 mini.
I got the Midnight iPhone Mini 13 512GB and it's fantastic. I forgot since iPhone 5s days that a mobile phone used to be a pocketable gadget.
For my use case and preferences, something that holds photo library, good camera, complete music collection and has plenty of storage to spare in the small footprint is absolutely brilliant. The iPhone mini really feels like a continuation of the original vision as opposed to the phablet direction. Don't get me wrong, I love my 8+ and 11 pro, but since moving to the mini I've brought my content consumption back to the computer or iPad and used the phone for communicating or listening to music. I'm actually enjoying the 'mini' portability so much that I'm consider skipping the M1 iPad Pro and getting the one-hander approved iPad Mini and this upcoming 16 inch MBP for big screen portability.
The battery life on iPhone 13 mini is definitely noticeably smaller than those bigger phones because of course it is physically smaller. But with my adjusted device use, this hasn't caused an issue. I do have the MagSafe battery coming, will see what that's like (have read little about it admittedly).
I just hope they keep the mini in the line long term. Anyone who's considering the mini for the portability and one handed use - go for it, you won't be disappointed (and with enough sales maybe they'll retain in for the 14 line!). I think I will keep my 13 mini until Apple release a foldable that folds down into an easily pocketable footprint.