Love how tiny that is, but I'm not a fan of the pin layout on those little Xiao modules. The connection pads on the bottom, including the battery connection, are a major pain to try to solder to. If I ever get around to playing with the remaining two I have, I'm gonna try using pogo pins or something instead of trying to solder onto them
Edit: I do really like that it has external antenna connectors for both Wifi/BT and LoRa (unlike my Heltecs). Assuming I handle the battery charging and convert to 5v externally (to avoid dealing with the annoying battery pads) they'd make a great "attic node" (in my case on a mast in the back yard) that could stay connected to my wifi rather than having to remote admin it over LoRa (Slow and not all config options are available)