I bought his Atlantis book and have read his Irish Origins series on Taroscopes. I'd say that my experience with his writing has been mostly positive as far as advancing my metaphysical and historical conceptual range. I read the Atlantis book right before stumbling upon the Cassiopaea website and it seemed to be a good general introduction to a lot of the topics Laura was writing about.
He does seem to kind of fit things to what he wants to believe, especially where etymology and ancient history is concerned, but at the same time provides a lot of interesting and valid points regarding the issue of "outer" control agendas hidden history. His writing style is very opinionated and personally subjective a lot of the time, so if that turns you off I wouldn't recommend his writings. He's very earth bound and pagan, but at the same time seems to be deeply spiritual, but more in a here and now rather than a higher density viewpoint. He also seems to have a scholar fetish as he makes clear his respect for various writers contstantly throughout his work.
The main problem I have with his writings, especially the Irish Origins series, is the importance he seems to place on race and specifically the "Great Aryans" that are the source of all things wonderful in the world, he he. That goes back to him being very materially based in his spirituality, if that makes any sense. To me his writing style reflects his lack of appreciation of the overall "oneness" of god as he takes a somewhat hostile attack mode towards TPTB instead of seeing the larger purpose and love of the creation.
I guess the best part about his writing for me is that it provides a lot of quotes and interesting factual tidbits that can open a lot of different lines of thought not previously focused upon. Also, while I think he sometimes takes liberties with his etymological research and conclusions, he has provided me with a lot of "good" info in that department which is cool because it is one of "passions" intellectually.
Overall I would just say keep your discernment at a high while absorbing his particular stances and take in what resonates or peaks your interest.