very useful after seminary
after many efforts on learning Hebrew in seminary, the most important thing is to use it, whether in morning watch bible reading, or in sermon preparation, etc.,... and this or similar reader's lexicon is most useful for this purpose.
I have the habit to xerox the BHS and this reader's lexicon for a certain book of Bible, bind them together, and take it when I go out, reading it while taking train or subway, (this is hardly feasible if I use the heavy BDB, not to mention the 5-volume HALOT, ) .
I gain a lot from this habit !