I've been using it for a few months. Great project. I especially love adding i2c peripherals from M5. E.g. a bank of 8 rotary encoders.

Also love how absolutely minimal it is in size and if you didnt notice, the screen is a touchscreen. And they have a basic set of ui widgets.

Also interesting, the gfx lets you overlap sprites, bitmap, and text mode. You can tell the designers have lot of XP on 8-bit systems. And the bitmap is a little larger than the screen so you can do some superbitmap stuff. It's bot terribly larger, just a bit.

I havent been using it as much for its synth capabilites, ironically, but for making sequencers for external instruments. I believe it also has audio in...

Also the discord is helpful. 10/10