From my small amount of personal experience thus far I have to say that a co-founder is tremendously helpful as a sounding board, someone that lives and underst

From my small amount of personal experience thus far I have to say that a co-founder is tremendously helpful as a sounding board, someone that lives and understands the product as much as you do debate various features and discover hard to track down bugs or architecture problems. At different stages so far we would have been setting ourselves up for big problems down the line if not for things we caught discussion the product with each other. So you can get a lot of outside opinion and advice but it doesn't really compare to having someone who spends just as long as you wrapping their heads around exactly how it works and where we are at. To be fair I don't have any real experience as a single founder on something of a similar scale to see both sides of the fence.