Been looking for this sort of device for my Pantech laser.
The cartridge is good for 1,600 pages - no more, no less.
All well and good, they’re cheap, except… the vast majority of my printing is in A5 size (roughly half-letter, or exactly half-A4).
Those half pages count just like any other page against the total, and I get shorted by the better part of 800 pages or so.
I’ve worked side by side with RU devs who were both personable and damned competent. Never were their tech skills in doubt, and I retain quite a bit of respect for those individuals.
I’d not do the same today explicitly because of the political and compliance implications. It’s unfortunate, but necessary.