Good way to get an overview of the city. The tour is somewhat driver dependent. I bought a multi-day pass and one day had a driver who took the tour part seriously and slowed down so that you could actually catch the sites. On another day, the bus driver was simply driving and didn't greet guests- guess he was having a bad day.
Oxford is not an easy city for driving around, so we found it helpful to just park at the Park and Ride (Redbridge) outside of town and take the bus into Oxford. The only reason for not giving 5 stars is the limited hours. We were rushed for time for fear of missing the last bus to the car park.
Arrived at Stop 8 at 3:30 pm and no bus arrived after waiting for 20-30 minutes. Walked the short distance to Stop 9 and waited until 4:45pm no bus arrived. My wife and I had to walk to Oxford train station to take train back to London. Only good thing about the experience was the map you provided us. I used it to find shortest distance to the train station.
Great day out , saw all of the city , did a whole round trip , then went round again getting off when we saw something we liked , then back on again to another stop , we did this all day , great way of seeing a city well worth the money only had to wait 5 or 10 minutes for next bus great service