I hated Ortho-K - they couldn't get the lenses to fit correctly so they hurt my eyes and some days I would wake up with imperfect vision (at a basically random power).
Do you think it was the fault of antiquated machinery, the doctor, or your eyes that caused the discomfort? How long ago did you do it? I have been doing some research on it after posting my query and it seems like they have improved the process behind it. ymmv though.
It was over a period of four or five months, ending about six months ago.
I think it was the shape of my eyes at fault - i would have a fortnightly scan, they would remould the lenses (which was done at some central factory, not by my doctor) and they still wouldn't sit correctly.