Ya I have been using it for a while but many of its features resemble those of Google services and also it is sometimes buggy. For example, options menu gets jumbled, try to open a mail in flash interface and then click on control panel, the opened email interface remains there covering lot of things, sometimes. It is slow because of flash interface, so it may take time to get speed in India at least and plus many common features are missing like email search etc.
this one is heavy and slow, ajax is better, atleast it works fast... but it aint as designed as this ... btw, its old news, regged loooong ago... now Y! mail beta also has that rightclick and stuff...