I know a guy that goes around with these new books getting bonuses and then bets more. The downfall, is that he never knows if the book pays, etc. Never gets a second chance. He Loses on his first shot.
I try them all, get some keepers. I'm very happy with Youwager and a dimeline to -190 and bonuses and slow moving lines. At least 80% of the books I try are hopefully for just one bet.