I still use my old Kobo and love it.

Works perfectly, despite being like 8 or 9 years old now. I've read dozens upon dozens of books on it, it still works like new, still syncs well, has multi-month-long battery life, is lightweight enough to keep in a bag at all times. Works perfectly with OverDrive for eLibrary stuff as well.

My only complaint is that it uses the old micro USB cables to charge (it's the only thing I use regularly that doesn't work with USB-C).

The new Kobo's look nice (and now support color, and bluetooth audio, and such). But I wouldn't actually use any of that, my old one still works just like new, and it feels silly to buy a whole new e-reader just for a minor USB-C charging convenience.