if you are going to do a lot of TT to China you may find HSBC a better option, many of my suppliers hold a HSBC account in HK in the name of an export company that they control, it makes things easier all round.
Because I am HSBC also it means my TT go quickly and cheaply to source, sometimes that extra two days is worth more than using a 3rd party currency converting company for the .2usd more I get, when sales are very time sensitive.