Good software, like wine, takes time.
A user interface is well-designed when the program behaves exactly how the user thought it would.
All non-trivial abstractions, to some degree, are leaky.
An idea isn't worth that much. It's the execution of the idea that has value. If you can't convince one other person that this is something to devote your life to, then it's not worth it.
Shipping is a feature. A really important feature. Your product must have it.
Nothing works better than just improving your product.