Unfortunately you are going to have some of those as you feel your way through what you like in a provider. I think we have all experienced this, and I don't know if I would call it remorse versus learning. What you or I may love in a provider, another person does not value and vice versa.
What I will say is when you find one that really turns you on, hire him more than once. I have found that if things seem to be good from meet number one, they only get better as you learn about and get comfortable with each other.