I want purchase a Nikon Transmitter?

I want purchase this Nikon Transmitter http://www.electronicbazaar.com.au/transmitter/nikon/nikon-wt-4-wireless-transmitter-compatible-with-d3--d300--d3x--d700.html
please tell me somebody is it of good quality ofr not

That looks like a genuine Nikon WT-4, that's reasonably good gear. Yes it will do what it's supposed to do and do it well. On the other, as is typical for these kind of products, there's some things to know and some weird ommissions in the design. Read this: http://www.johngaltproductions.com/wt4review.html