Match
How much free money the house will give you as a percentage of your initial deposit.
Max
The maximum amount of bonus money you can receive initially.
Value
The bonus as a percentage of the amount you need to wager to clear it; [bonus] / [(bonus + deposit) * (playthrough requirement)] It is an estimate of how much edge you are reclaiming by playing with this bonus.
Interface This rates how easy to use and pleasant to look at the company's website and software is.
Events This reflects the depth (number of different bets on each event) and breadth (number of different events) of the sportsbook's coverage.
Cashier This is a rating of how quickly the sportsbook processes
withdrawal requests, how quick and helpful their support services are.
Promos The more frequent and better the site's promotions are (free bets, bonuses, tipping competitions, etc) the higher score they should get here.