Advantages: 

Benefits of Using Octopus: 
The Octopus can be widely used in over 80 different Service Providers' outlets, including public transport, parking, fast food shops, convenience stores, vending machines, access control systems, and leisure facilities. Specifically, 

Octopus is useful for your daily life: 

The interaction between the card and the processor is contactless, providing a fast and reliable transaction, and in most circumstances, without the trouble of removing the card from the purse or wallet. 

With the provision of numerous sales outlets, both automated and 
staffed, users can enjoy great convenience and flexibility in buying 
or reloading value onto their Octopus cards. 

The Card can be commonly used across multiple modes of public 
transport in Hong Kong, allowing passengers to change modes 
without buying separate tickets.There is no need to carry 
cash or worry about exact change for individual journeys. 

Discounts are applied when using the Octopus for a number of services. 

Octopus provides small value convenient payment capability in fast food shops, vending machines etc, thus solving the problem of finding the correct coins for small value purchases.



The Octopus Card system is designed to provide a fast, reliable, cost-effective and convenient method of fare payment and collection, with the following unique features: 

Contactless : 
Allows cardholders the convenience of operation, without withdrawing cards from wallets/ purses. 

System wide : 
Allows cardholders to use the Octopus on over 40 Service Providers' Systems. 

Convenient : 
No need to carry lots of cash or exact fares for individual journeys 

Reliable : 
Achieves higher reliability and availability due to contactless operation and no moving parts. 

Easily rechargeable : 
Value can be loaded by a variety of automated and operator- assisted means. The value can be loaded in fixed increments up to HK$1,000 to suit different cardholders' spending requirements. 

Secure : 
The smartcard technology is highly secure and is backed up by a sophisticated backend system ensuring high integrity and reliability.

disadvantages:

When you loss the octopus card if you can't find it
immediately the may be give people use it.

When the octopus card values is negative that the card can't not be used.

When you use octopus card to pay the transport ,eg :  bus, MTR ,KCR ect . you must wait a few minute , than you can use it again to pay transport.