We got the 3 day pass and travel card. Well worth it. Underground, DLR, buses were all covered. We visited Tower of London, Tower bridge, St'Paul's, London Bridge, and Greenwich. The six day pass would have been excellent to cover most places, but we had only 3 days. Would definitely recommend the pass. If possible , collect it it a day prior to sightseeing from the visitor center, so you can use the Travel Card right away, next morning. The travel guide needs updating. Website was more accurate.