So, my ratings:
[4.5] nitrogensports - no problems, but only few live events; weak match line without alternative totals, handicap, etc; very slow betslip grading (using 1.5 years)
[4] cloudbet - no problems with KYC, bonus and withdrawals (2 years). Raffles in bitcointalk
[4] anonibet - now without problems (but using only 3 months).
[1.5] sportsbet - Fast withdrawals. Refused welcome offer BUT sometimes site credit athother and sometimes not(free spins, free bets, ...). Maybe it depend on the phase of the moon. Terrible support in significant questions (damn, but they try to be nice) (sometimes... but 1.5 years)