I haven't heard much out of whiteline shocks, struts, and coil overs. However, I have heard their springs and sway bars are top notch and have actually just ordered a set of super low springs from them from a US distributor last week.
As for their coilovers, I would buy different coil overs. For the same price with a lot more praise than the whitelines, I would go with either the Bilstein or Koni suspension. Of course they are only available in OZ, you would have to get them shipped over. Koni, of the US, has just released a shock insert for the front shocks. Still waiting for the rears to release.