So far I think the reaction has been favorable, but several reviewers reinforced my concern about some of the known issues.
So with version 1.1 I've improved the audio rendering, hopefully to a level that will satisfy everyone using the app. Additionally I've added the ability to change the frequency of the audio that is generated. Lastly I've diversified the training sets... in addition to the primary training set that shipped with 1.0 I've added training sets that just contain letters, numbers, prosigns and punctuation.
I've had thoughts and requests about adding a capability to train using sample QSO's, but that will have to wait until the next version.