I will give approximate marks and comments what I know about.
Betcity - limits 2/5, arbs 5/5, reliability 3/5
Bizonbet - limits 2/5, arbs 3/5, reliability 3/5
Contorabet - don't know, but it's OddsMatrix bookmaker
Melbet - reliability 0/5, other is unnecessary
Sectorbet - limits 2/5, arbs 3/5...