When used within the Republic of Ireland, my experience has been quite positive. However, once I attempted to use roaming, it became hopeless and unreliable, even in Northern Ireland. I faced an issue recently that cost me €55 due to being unable to check in online. I followed the provided manual instructions, which shouldn't be necessary, but still had no success. In summary, if roaming is a significant factor for you, I would not recommend this service; it's best to avoid it.
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