I'm glad you like the app =)
While I won't re-hash all the Hema stuff here, and I'm also disappointed that there's only been 1 update since it's release last year, trust me when I say we will get there =)
For the few thousand folks that have been using the Hema Explorer platform, I think it works well. I think the ability to see tracks from others and import their tracks/waypoints into your system is awesome.
I also like that it's only a 1 time $20 purchase. Maybe premium features will come later, but for now not having a subscription is a good thing.
FYI: you can see the portion of the CDR Expedition my family recorded here: http://hema.li/cdr3
We used 3 different layers, all offline when we were on dirt, no issues with the app at all. We ran 2 iPad minis, 1 iPhone, and 1 Android tablet as a backup.