These buses are a good way to gain an oversight of a city. Kuala Lumpur's route does just that. Unfortunately there appeared to be no restriction on the number of people allowed on the bus at any one time which resulted in people standing on both the lower and upper decks. I don't know for sure that this is why 'the balloon (?tyre) burst' but we all had to get off and wait for a relief bus to arrive. This took over 20 minutes and some fellow travellers told us that it was the second bus of its type that they had been on which had broken down that morning. We were concerned that we too would have to stand were we to hop off and join another bus so we went round the whole loop in one sitting.

The commentary was very limited and was often behind the bus's location. It was a missed opportunity to share the historical and cultural context of Malaysia in general and Koala Lumpur specifically.

For RM45 (approx £9) it's very expensive compared to just getting a taxi if you know where you want to go & if there are a few of you.
We went from KL tower to Central Market which was fine (although packed so no seats), then onto Merdeka Square (got seats this time), but once we were finished we waited an hour and 20 minutes and no bus! The brochure states 20-30 minutes intervals. We had to give up and walk or we could have missed our time slot at Petronas towers. Traffic just seemed to be getting lighter and lighter and there was no message on the website to suggest why it was so late.
Unreliable and expensive. Just get a taxi.