Oh yeah definitely.
Digital copies of WD are awesome. Especially with units that had rehashed rules. The original rules for assassins was about 15-20$ canadian. But then the WD with new rules is only 5$ on black library. So even just from a dollar value the WD was a huge deal.
I was considering getting the WD issue with the new rules for the Ork Looted Wagon. Only because I wouldn't trust any downloaded rules I could find and then at least I could prove that I have "official GW rule set" for said model.
Me personally haven't played against a rule noob yet, but have heard that some people won't use any rule not officially made by GW in an official GW product. Ie GW books and WD.