There is no substitute for real-world feedback. Matt Mullenweg writes a compelling blog encouraging us to just ship it (this is the guy who helped bring us WordPress). He uses the example from Apple, and the development of iPhone. Steve Jobs commented in 1983:
Usage is like oxygen for ideas.
Note to self (after Voltaire):
Don’t let perfect be the enemy of good enough.
Thanks to Seth Godin for sharing and making this original post known.