Anyone got ideas how to check reliability of a travel agency...

or anyone heard about this travel agency Priority Guest(M) Sdn Bhd.

recently i join their membership and get a Priority priviledge card at Giant Kelana Jaya
they said i can get 50% discount of all the hotel in malaysia.
and also can get promotion prices of air ticket.

it let me feel wired......
i just worry i get into travel scam because last time there are a lot of scam and very popular in malaysia....