I was relieved to finally get my hands on this, thinking it would finally solve all our Scrabble problems. But I'm actually surprised at how many words it doesn't allow, especially disappointed about it not having two-letter chemical elements (I suppose these are abbreviations but still!) On the other hand though, it has been most helpful in alerting me to words beginning with 'q' in particular, such as 'qat' and 'qi(s)'. So a compromise has been reached, we now use both this AND an ordinary dictionary! Well, we aren't exactly professionals!