overall very impressed with how well the Manta works, the excellent build quality, and how well thought-out the features are: very happy to have it. it has quickly become my organisation tool for work notes, ToDos, meeting notes, etc.
on the downside I found that there wasn't a lot of good introductory material on the primary features -- headings, keywords, digests, layers, etc -- and would have appreciated a video on each feature showing the different ways it can be used.
that said, no regrets, and i'd happily do it all again.