About half of the guys at my club who play FoW play EW as well. I limit myself to EW since I think it is the most fun out of the 3 periods that I have played. Hopefully it will be more popular once I release my September Campaign v.2 book which will include lists for Germans, Poles, Slovaks and Soviets based on historical forces fighting in 1939 and offer a wider diversity between each force.
I may post some teaser info soon, as I just finished writing the Polish section (13 different lists). Currently reasearching and writing the Slovak lists.