I don't. But if you have one of these cards and only top up using the default options as the original post describes (and I imagine most people do), it's effec

I don't. But if you have one of these cards and only top up using the default options as the original post describes (and I imagine most people do), it's effectively impossible for one of these cards to reach a zero balance. It will always EOL with a positive balance. Not so with Oyster, mine hits zero or very close quite often. Difference there is you buy an Oyster card up front.