Has anyone been on a trip with Contiki before?

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While researching for our honey moon trip, we came across quite a few travel agents that offer packages, local to the destination of travel. And the prices they offer are really competitive when comparing with the local agents we have here. There is a limit of age for those who are interested in joining this particular agent. One must be between the age of 18-35 to be eligible to join their tour packages. I am wondering, has anyone gone on a trip with them before? Or Have you heard about Contiki before? How was your experience with them? Going to e-opinions.com gave a mixture of good and bad reviews. It would be good to hear from fellow mylotters. Please advise