Having just used it, it’s good but not great if travelling about. This mostly my fault and not theirs as I didn’t realise I needed a mobile number that can sent/receive sms. Many services require an sms for account setup and it’s a PITA not being able to receive them. Bike sharing and taxis were the two I wanted it for. The other weird thing was that one of the cards I bought worked in the U.K. and one didn’t. I never did figure that out but the prices are so cheap it wasn’t particularly problematic. Their (physical) store is also extremely easy to use for a jet lagged foreigner.