1) Everything's really slow. Installation's very, very slow and not responsive and the add-in seems to add considerably to Excel start up time.
2) No ribbon, just three buttons on Add-Ins tab, it looks a bit unprofessional.
3) It doesn't really work - when I click on "Show sheet" it sends the browser to some local file slate.html in temp directory, which seems to have just:
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Where's the stuff I saw in the video? Was that Mac-only?
4) I'd look into using Excel-DNA/NetOffice instead of VSTO, which requires a runtime. That makes it easier for business units to subscribe directly without going through the IT and the whole procurement process, etc.