High refresh rate combined with low input latency is still a cutting-edge (read: expensive) feature, but I hope economy of scale will change this a bit each year. All the brands are building from the same components pumped out of China; there are other brands like Boox that are a bit cheaper and applying a downward pressure on brands like Remarkable. I own a Supernote, which was a big investment for me, but I was happy with the modular design (including easily replaceable battery) which in theory means I can spread the cost over many years, replacing parts as they wear.

I hope that these devices become cheaper and cheaper. Keep an eye out also for refurbished and open-box sales