Do not buy yet!
Im an developer myself, so I know that it takes some time to fix a problem and that Apple needs some time to approve an app. But the time it takes to fix this problem regarding disappearing UI elements is getting ridiculous. Ive paid money for this app and I have not been able to use it at all ever since I bought it. At least give your customers notice about whats going on. Did you at least submit the update yet?
cybersystem about Echo, v1.0