As an early adopter of the Luas card, a frequent user of the system and having a wallet-load of travel cards from other cities to compare it with, I have not found many problems using the Leap card. I had no issue with the account set up, despite using Firefox so I a surprised to find out there is an issue there. The system on Dublin buses is the most problematic. Without a second set of doors on the bus, tag-on/tag-off becomes more inconvenient to implement also they seemed to feel the need to mirror the existing fare structure. However, I've not had any issues with it (in fact I am more likely to have an issue because I forget to tag-off at a Luas stop.) The system undoubtedly needs an overhaul to modernise the bus experience but otherwise I think it money well spent!