As Mark pointed out, the incomplete web client is the most severe limitation right now.
Other limitations and/or missing features in my Win7 installation are detailed below. (I don't know if Mac installations exhibit different behavior, and I don't know if some of the items I've listed are bugs that may, at some point, be fixed.)
Whether you will consider these missing features to be "significant" or not depends on how you use TheBrain. For me, the absence of these features, along with significant speed and performance issues in TB9, means that I'm still keeping my primary data in TB8.Missing and/or Limited Features
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Missing and/or Limited Features
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