Arbusers

Hello,anyone knows if you use a broker like assianconnect or premium tradings to access a sportsbook or exchange you can play live,like having your own account without delay and having the same pending time?Because i read something about skype call etc..
And a broker will offer to you high limits only to asians/exchanges they offer,right?Or else we will all use brokers to play at softs with high limits.
And how do we know that these bookies are safe(some of them are not even at sbr list)