Thanks for the hint on a different channel; installed on iPad Mini 3 and iPad Pro 12" (v1). On the iPad Pro I have so far 92 on a DRUGS Phase 2.
What I a bit dislike is the fact that is seems not aggregating across devices (even when under the same Apple ID). And no team setup.
Else I like that (finally) some VC can be done on iOS. Though its painful as I need to keep the device unlocked the whole day. Not really nice as it give access to eMail etc.
Yeah...I had higher hopes for this when they launched. They also have a locked in deal with Vodafone too which kind of limits them. Otherwise I like the app with the same complaints you listed above.
I should also point out that though they are on Android and have been for a while, they appear to have added an iOS app probably around March this year. This makes it the only DC app on iOS that I am aware of.