Let me know if there is something more you would like me to post please. I would like to make this as complete as possible.
The Rosewill RNX-EasyN1 is a USB wireless adaptor, that supports b/g/n. Rosewill reports that the device does not function on linux. However, according to my tests (listed below) it supports both monitor mode and injection.
Device mounts as wlan0. It uses the RT2870/3030 driver.
airmon-ng start wlan0 reports that monitor mode is functioning on mon0. aireplay-ng -9 mon0 reports that injection functions. I do not currently have a second card that supports monitor mode to check which functions it supports exactly.
Again, if you want more info (related to the device), let me know. If I can get it, I'll be happy to post it. If not, I'll ask how I should get it so that I can post it