I was looking at the Xsight, especially after I read Daniel's review. They are currently selling for a cheap price on Amazon, but when I read the reviews the latest one that was posted today said they are being discontinued. I haven't called AR to confirm it, but here is the post:

"This product has been discontinued by Acoustic Research (AudioVox).
I called in to get support because the RF extender for it wasn't available on any site. They told me the RF extender has been discontinued and they're not replacing it with anything else. I asked them if they have a remote that will replace the ARRX18G and they stated they're discontinuing the XSight line and pretty much getting out of the remote business. "

If this is the case I would be concerned on the support.