I am assuming you are referring to a bug free app and when you say 99.9% you're referring to the % of functionality implemented as opposed to the quality level. Then I would say go live. I think Reid Hoffman's quote (founder of linked in) sums it up best. "If you're not embarrassed by the first version of your product, you launched too late."

Get something out in the market that gives you some idea if there is even a demand for the product you are producing. Not all good ideas are successful and the feedback you receive could even send you down another road, possibly saving you time and money building a product that no one wants.

Get that minimal viable product (MVP) out there, collect lots of data (analytics and feedback), learn and hustle.

If you want to read up on Lean start up philosophy and techniques buy Eric Reis book "Lean start up".

If you need any further assistance feel free to give me a call

Steve