I have one of these and built a few for my friends. Honestly a fantastic system. I find myself playing it way more than my Analogue Pocket.
If you’re not a fan of their bootlogo heres an unofficial fw with the original gb/gbc bootlogo (its in the patched_fw directory)

I put mine together last week. Cool piece of kit

https://funnyplaying.com/

product and pricing are enticing

plus they sell a blank rom for rom burning

I deeply miss my atomic purple GBC, so for the price and overall quality of this, this definitely looks like an awesome replacement. I’d love to get one eventually