Is the Sunrail card like Oyster in as far as that you can go anywhere with it and the fare is correctly calculated?
Yes, the SunCard is similar to the Oyster card in regards to that when used as a "prepaid value", you need to tap on, and tap off, and the correct fare is being calculated.
For example if you tap on in Altamonte Springs, and tap off at Sand Lake Road, the SunCard will deduct $3 as one county line was crossed, so $1 is being added to the $2 base-fare.
The SunCard is still different compared to Oyster in several ways, some of them are:
1) Oyster offers a daily cap, still so far I did not see any information about a maximum daily price charged on "prepaid value" SunCards.
2) Oyster is offered through several different modes of public transportation - besides being valid in the London Underground, it's also valid in London Buses, London Overground, DLR (Docklands Light Railway), Tramlink, Emirates Air Line (cable car) and National Rail (within Greater London only). Many might think this difference cannot be seen as a shortcoming of the SunCard though, as Central Florida does not offer so many different modes of public transportation in the first place (yet
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).
3) Oyster charges a 5 GBP deposit, while SunCard is bought for $5. So an Oyster card can be returned, and the rider will receive the 5 GBP back. Any information about returning a SunCard once it is bought is not known to me yet.
4) Oyster offers an "auto top-up" function, when 20 or 40GBP are automatically loaded onto the card, once it has less than 10GBP on it. This offers even more convenience for occasional riders. So far, no information is known for me, that "prepaid value" SunCard is offered with an automatic re-load function.
The disadvantage of this is that you need to tap in AND tap out so the card knows what to charge you.
Yes, also with SunCard on SunRail, one needs to tap in and also tap out. With the Oyster card, there is a penalty for not tapping out. How the exact process is with SunRail if riders "forget" to tap out, is not known to me yet.
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If reloadable fare media and the mandatory tap out really is a disadvantage, could be the subject of debate. Sure riders have to get used to it, but many might think it could also be a very effective and convenient way to travel.
The alternative is that you tell the card what trip you are making when you buy the card. For a passenger making several different trips regularly, this would require holdings several cards with a risk of confusion.
At least some might think that this alternative would be not as good, compared to the current tap on, tap off process...