I don't know what grabs you but for me with the FitEar TG!334, MH335DW (and to a certain extent the Monet too), is the warm involving laid back signature. I was at Fujiya with a friend yesterday and we both tried out the MH335DWs (actually we tried it many times but just keep going back). The way he described it I think really pinpointed what the FitEar's signature is about - it has a tube-like signature. It feels natural, warm, provides detail in a very subtle way.
It's like the more you listen, the more you learn...but at your own pace.
To me, now that a lot of people can access the MH335DW, it's not really unique anymore. Also the store won't sell their demo's. One thing on how Japan works is that money doesn't always speak ;-) - doesn't matter how much you throw at them.