It works !!!!! But I also use Rom Manager and Bootstrapper as well as Superuser, so I can do everything over the phone and not have to hook up to a pc. Downloaded ROMs and applied them with Bootstrapper. Z4 tells you when your phone is rooted. Make sure you get the right Z4 off the market. There's another one out there that should be avoided from an Asian developer from what I've read.
Directions for this stuff was a little hard to come by but after a little searching everything was good and the DX is fully rooted to what I want it to do and look like. Z4 has been good to me and I have had it since it first came out on the market.
No complaints !