The product looks rather cool and congrats to the team, but I have some concerns with this, Today, after three years of silence and hard work, I finally get to announce the launch of Sigma... we’ve raised to date ($18MM)

1 - Building an online-based collaborative design tool is nothing that novel, it's all about execution. Why keep it a secret. What do you gain by keeping it stealth?

2 - $18MM to spend only to see if you got it wrong is a rather interesting approach.