Indeed the best of Rome. The Palatine Hills, The Forum, and yes, the Colosseum was a great experience. This was a 2-day pass, and our first day was the Vatican, The Vatican Museum, Sistine Chapel and the St. Peter's Basilica. This is the most important highlight of our Italian trip. The Colosseum is a must, but unfortunately, it was over two hours wait before we could go inside. I hope the Italian Tourist Board can find a manageable way to ease the clutter. I knew they are doing their best to have tourists the best wonderful experience.
I would recommend arriving at the touristation more than 10 minutes early to collect tickets. Rome is a very busy place and lines can often take longer than expected. Booking these tickets did make our waiting times a lot shorter. It is good to be more prepared visiting these places than buying your ticket on the door on the day. Overall good experience.