The real problem I have in regard to Weisser's book is not the amount of inaccuracies in it, as these are easily disregarded if you know not to rely on it. It is its wide distribution and position as sole english language book of its kind. As a result it still gets used and relied on by people who don't know of its flaws and, even worse, gets used by others when writing their own books.
For example, I noticed that it is listed in the bibliography of the italian Dizionario that has just been released. I hope this is as a result of the author's being aware of the book, not because he used it as a reliable source of information!
I guess for me, this is one of the things which makes the work we do on this database so important.