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I had a look at Sigasi, and my personal impression is that it a professional Emacs user will achieve a higher productivity from Emacs, than an experienced Sigasi user.
the problem is becoming professional with Emacs....
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Sigasi HDT 2.0?
They show this
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Sigasi Starter Edition: Forever Free
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on their web-site. (And I tend to trust my fellow-countrymen).
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That's before mentioning the open source vs. propriety issue.
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This is totally moat. We're both using Altera designs Tools. What could ever be more proprietary?