I've used a Pocketbook Color for over a year now. And yes, it is a somewhat darker screen, but that mainly just means I turn on the frontlight in some cases where I wouldn't have needed to with other e-readers. I've otherwise been having a good time with it - comics and PDFs benefit greatly from the color screen, and regular text is fine too.
Agreed, I picked up Pocketbook Color for 150 Euros on a sale and it has become my main bedtime reader.
Disclaimer: I've been using e-ink based readers for over 10 years. My current lineup is Kobo H20, Remarkable2 (which I sort of love/hate), and Sony DPT-S1 (which is fantastic for bigger PDFs).
B&W is fine on color e-readers. I actually enjoy the washed out color look as well.
Fully agree here, I'm in the PocketBook Color squad since 2020 and got it at full price and absoltuley love the thing. Appart from the fact they don't sell official covers for it anymore since i seem to disassemble those regularly.