This is definitely the main point in this "debate"; some people will just prefer one screen type over the other. A lot of people seem to be advertising these opinions as objective fact, and that's quite a dangerous trend.
I'm personally of the opinion that e-Ink is what I'd prefer for reading, but I absolutely despise reading on screens; anything lengthy I print out. And while I think that e-Ink is better for reading, that's all that e-Ink devices (while being a lot cheaper than the iPad) do. If you read less and do other things more, then e-Ink is unlikely to even be an option for you unless you feel like shelling out for another device for the few times you do read at length.
I'm a rabid reader, and buying an e-ink device was a boon: though I've read many short papers on my laptops and a on my phone, I certainly wouldn't read thousands of pages at once on an LCD device, and I've precisely done so with my PRS. That, and the battery lasts 2 weeks of constant reading.
I'm personally of the opinion that e-Ink is what I'd prefer for reading, but I absolutely despise reading on screens; anything lengthy I print out. And while I think that e-Ink is better for reading, that's all that e-Ink devices (while being a lot cheaper than the iPad) do. If you read less and do other things more, then e-Ink is unlikely to even be an option for you unless you feel like shelling out for another device for the few times you do read at length.