which provider, page-38

Depends what you are trading, remember alot of instruments have contracts getting trade 24 hours even the market is open for 8 so obviously out of hours there is no correlation between the underlying market and the cost of the contract.
Also a garaunteed stop loss will actualy show up us a bid in DMA if i'm not mistaken, making it a juicy target for stop hunters, i'm definitely not saying not to use one by the way.
Always use stops, make sure they are garaunteed stops on volatile stocks cause gaps hurt!

Ps: i hope the Pies lose the grandfinal by 1 point from a goal after the siren! Bastards :)