I like to add my own comment to this. I had no previous experience of using this type of service but was desperate to get to one of the RnRII concerts so decided to try i-TM4U.
The i-TM4u staff helped me to find tickets (or the entitlement to two tickets! Let's hope the tickets issue as promised in March) for a particular RnRII venue (I'm so greedy - I wanted to combine Gackt with the good chance of sakura!) and then provided some helpful advice and research to consider hotel options in the same city. The i-TM4u staff have always responded carefully and promptly to my tiresome emails and I can't fault their patience and willingness to help. Their functional English is perfectly competent and, once you start a dialogue with them, they manage to make the transaction/request seem a lot less confusing.
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The i-TM4u staff helped me to find tickets (or the entitlement to two tickets! Let's hope the tickets issue as promised in March) for a particular RnRII venue (I'm so greedy - I wanted to combine Gackt with the good chance of sakura!) and then provided some helpful advice and research to consider hotel options in the same city. The i-TM4u staff have always responded carefully and promptly to my tiresome emails and I can't fault their patience and willingness to help. Their functional English is perfectly competent and, once you start a dialogue with them, they manage to make the transaction/request seem a lot less confusing.