iPads are far from a glorified screen

When they become available in the UK, pop along to your local Apple store or reseller and play around with one, see what you think of them. I've not been lucky to be able to get my hands on one, but I know a few people who have and I hear they're as good as they say they are
I do have an iPhone though, which has a similar screen. All I can say is eye strain is really not a problem. Electronic ink, in my opinion, is a bit of a dud technology right now and isn't as good as they claim it is. Sure, it's clear, but it's also very slow. LED powered screens is the best we have, until the next generation (
oil based) electronic ink comes available. And reading on modern LED/LCD screens isn't that hard on the eye. I read the paper every morning on my iPhone and read ebooks from time to time, and never have any problems
And to be honest, I think that electronic readers are a bit of a stepping stone technology. I reckon within the next few years technology companies will start developing their own equivalent of the iPad, and these will become the device that we use to read ebooks (because they can do more stuff) - a bit like how everybody uses smartphones now