They look like nice boards and I have some mentally ear-marked for future projects. I was about to buy a couple recently but I already have desk drawers full of barely used development boards. (I am too ashamed to show you them all.)
This is now my virtual parts drawer. It's full of interesting things to add to any upcoming order - especially if I'm near the free shipping threshold.
I like that there are a huge variety of them and they can be directly soldered to a PCB assembly with their castellated pads. I have many of the variants. I have a few of the newer ones that I haven't had a chance to try yet - ESP32C5, RA4M1 and nRFL15 Sense. I like that most of the newer boards have battery support. It is also nice that they are compatible with Adafruit QT-PYs. Adafruit has some nice add-on boards and a couple of RISC variants.
