Hop-a-Jet has a good reputation, if their facilities are any indication of their safety culture, you're in good hands.
As with any 135 operator, you should ask some questions when you meet the crew.
When is the last time you had simulator training?
(Within twelve months is the only acceptable answer.)
May I see your FlightSafety pro card or Simuflite 61.58 card?
(If either is unable to produce the card, don't get on the airplane.) Pan Am/Simcom training doesn't count.
Ask to see the aircraft discrepancy logbook. Are there any deferred items? Are there more than one? (Convenience items don't count, such as ashtrays or stereos.) Do you see multiple maintenance entries that read: "Could not duplicate" or "Ops checks OK"?
Does your company provide initial and recurrent CRM training? How long is the class? (Initial should be at least one day) Who provided the training?
Who is your operation's Director of Safety/Safety Officer? What mechanism is there available to report hazards to that person? (The phone doesn't count)
If you don't get a warm fuzzy from the crew based on the above questions, walk away. One last thing, Is the jet dirty on either the outside or the inside? If it's filthy, walk away.
Without an expert to help you navigate the nuances of what's appropriate, the questions above should help seperate the bottom-feeders from a reasonable operation.
It mostly comes down to karma. You don't have to be an aviator or a safety expert to know when something just doesn't look right.
P.S.- Wyvern approval means nothing.
Feel free to drop me a PM if you have any questions