I brought these last week as an upgrade from my older Netgear HDX101 Powerline adapters which i've had for 4 years. The XAV101v2 adapters arrived and were easy to set up; just plug them into the wall socket, plug in the RJ45 cable and you're away. I found a big increase on speed vs my older HDX's, which were averaging about 88Mbps, to about 125Mbps.
The issue came when trying to connect my iPhone to my PC's iTunes library to control my music around the house. With the HDX's it worked no problem where i have the iPhone 'Remote' app connected to the wireless router which is in turn connected to the Powerline adapter that connects to my PC which hosts the iTunes library.
Although you can add the device in iTunes the library does not pass through the XAV101 powerline adapter, due to i'm guessing, the added security features in the newer adapters. But when i switch back to my older HDX's everything works perfectly fine.
There are threads on both Apple's and Netgear's support forums about the issue and I've logged the issue with Netgear support, which they say will be lab tested in the next week.
In summary: Excellent product and what you'd expect from Netgear, but simple sharing issues need to be resolved or allow you to disable the security features. If they can fix the issue then i'd give them 5 out of 5.