Terrific! For the cost it was very good. We did rent iPad devices in the Duomo which we suggest for viewing the Duomo itself, the Crypt and Museum and Bapistry. As this was not really a tour we just received discount tickets.
You should tell people that what they get from you is a voucher, not tickets. When we arrived at the Duomo, we had to walk up about 50 steps to exchange. Really upsetting as my husband is mobility impaired.
This is a very useful combined ticket note, it does not include the Gateway to Heaven because it avoids long queuing times. Obviously this also means that you get more viewing time but it also means less time standing in the sun. We highly recommend this. At peak times, however, there is still a need to queue simply due to the mass of people, but at least you only queue the once to actually get in and not to buy the ticket itself. We have also found in the past that if you can leave it til late afternoon the crowds will be much smaller and the whole cathedral experience much more enjoyable.