It has been easy to find good services and I like that Thumbtack has already done backgrounds on the people. I also depend heavily on the rating system and reviews.What I don't like is that you apparently charge contractors just for responding to me before I have chosen them. I keep hearing it from them and feel like I'm getting the blame. You should make that clear to the user so that we don't send our multiple requests when it may not even be needed. The fact that you instead suggest sending the request to additional people is disingenuous.
