I like the two speed ZA better than my E50 most of the time. The E is simpler and easier to maintain, and the deeply satisfying aspect of SIMPLE transportation just makes you smile, ride on, and keep these bikes alive. But the ZA is more capable of exploration with its low end. The E just does not like to explore anywhere under 10mph and/or unpaved. The ZA does.
And I have to say... on any summer day, when I trot out to the garage for a summer ride to the beach or anywhere within 15 miles of my home, the Puchs get lit up more often than the much bigger brother BMW. They just make me unreasonably happy.