I enjoyed them and am glad I completed them but I stalled several times trying to get through them.
I thought there were a lot of good ideas in them that seemed plausible, especially given our knowledge of Mars in the early 90s, but I'm not sure how well they stand up to our current science. I would say, if they do stand up to current science, they would be good to read as still "plausible." That's the fund part of these books to me. But if they no longer really align with the science then I wouldn't try reading them if you have stalled out already.
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