Finally there is a new sportsbook that is a bit similar to directbet where users are not required to have an account to place bets.
When you mentioned directbet I had to check them out and I must say they are quite similar... though I see Spirebets has the edge with its better user interface, bet suggestions and so on, waiting to try them out to see how fast the settle wagers. I haven't checked about the odds you offers compared to other sportsbook sites, so I have no ideas whether your odds is competitive enough or not.
Odds look competitive with other sites I use, only drawback is less games to bet on 
guess will have to wait for alpha version.