I am a new FM Go user (with 20 years of FM/FMP experience) and rather disappointed that some of my FMP solutions do not work in FM Go. I really believed (as there's nothing contrary in the documentation, eg. in "FileMaker® Go Development Guide" part "Differences between FileMaker Go and FileMaker Pro") that the stuff I've done would work.
Why is this so? Are signatures more important than voice notes (think about lawyers, doctors and - in my case - facilities managers doing audits of spaces & inventory.) Surely signatures are great trade show ponies, but are they relevant? Will UPS and similar switch to iPads and FMP? No!