Brendan,
I am a former Bento user who has been using TapForms for a few months. Over the past several weeks, I have slowly made the transition to iOS 8, an iPhone 6 (from an iPhone 4), Yosemite, and iCloud Drive (in that order).
I am running Tap Forms on my iPhone, MacBook Pro, and iMac. I also have my son (13 years old) learning to use TapForms on his MacBook Pro. So far, so good with TapForms.
I appreciate the forum postings, especially those from the users who troubleshoot the initial versions of iOS8, Yosemite, iCloud Drive, and TapForms (both iOS8 and Yosemite). After watching the postings for a couple of weeks after a new release, it has allowed me to carefully decide when to upgrade the various software.
Thanks to Brendan and everyone for continually making this a great App.