Concerning the 572 from wgldesigns, I've read posts from some of our more illustrious members.
Brian H, Charles Sullivan, Tuicemen, TakeTheActive and KDR.The description:A 572AB is a RF transceiver that receives all 16 house codes. It comes with an external antenna that provides greater reception, giving you greater range with your transmitters.
Because the V572 receives all 16 house codes, you can replace up to 16 transceivers such as the RR501 or TM751 with one of them. It also comes with a PSC05 power line interface module, which sends the X10 signal to receiving modules, such as, light switch modules, lamp modules, appliance modules, etc.
It can operate without a computer and be placed anywhere there is an electrical outlet. However if you wish more custom control, you'll need a PC to run the software after which you can move it to where ever you wish.
I hope this explains it sufficiently.
If not; Go to:
http://www.wgldesigns.com/