Well, as for getting credibility...two thoughts for you..
1) You can always do the trial route...I've trialed dozens of services over the last 3 or 4 years and those with merit I either used for some period of time then as a paying customer or at least passed on the recommendation to others who could use them.
2) Approach someone else with credibility...i.e. maybe some of the brokers or chat room mods that advertise on ET, (Risk Less, or BrandonF) or some of the bigger guns in the business, a Vic Niederhoffer or Larry Pesvanto (Just throwing out names that are in my head tonight, but there are hundreds of guys with name recognition and client bases already) or even MarketSurfer from the ET board here who has some credibility among this population, etc and seek either an endorsement, or a reciprocal referral type deal.
dunno if there's any merit, just some food for thought