The basic function is just OK. It is very frustrating when entering a search term (eg, "spent"), to explore a branch meaning (eg, "spent foolishly") for that term and then discover that one has to retype that term to explore another branch meaning (eg, "spent like water").
I havent seen any significant improvements in the basic product except to offer to sell me upgrades (which I have all bought).
Steve_.W about Thesaurus Rex by Dictionary.com