I recently deployed one of these in a small home office environment for one of my clients.
D-Link Wireless N Range Extender
Got it through CDW.
It works as advertised.
One thing the wireless clients would NOT do with this setup was successfully hop from the Wireless Router to the Wireless extender. D-Link confirmed the settings were accurate and blamed the firmware of the d-link wireless router, but that did not cure anything.
NOTE, the wireless clients that would not roam successfully from WireLess Router to WirelessExtender (when walking around) were all Apple devices (iPhone, MacBook pro, etc). PC based devices functioned fine.
all boiled down, the extender setup quickly and easily out of the box. But not a win on wifi iPhones roaming between the router and extender.