* What kind of device do you read the technical e-books on?
A regular PC.
* What original formats do you use, and how do you prepare/convert them?
PDF is the main format. Since most of them come from the outside I am at the mercy of the company preparing them. CHM is the most problematic format for me.
Those documents that are prepared here are mostly in PDF including a Tech User Manual for one company in Sony Reader format. We have used special PDF format and LRF format. The jury is still out.
* Are you happy with your solution? What would be better?
For 95% of the documents, yes. They are reference so search is a requirement. While I would like more material on the Sony Reader that is not an option at this point.
* Does your solution require perfect eyesight?
No. I wish I had it. Most of the people I work with need glasses to read (OK, there is one; but I suspect that she has LASIX surgery and took the one near and one far option.)
* Have you given up and decided to read the paper versions for now?
No, not an option. To get a paper version of most of the material would mean to print the PDF. Few of them are available in hardcopy.