Hrm. With the Sager drivers, I had a lot of trouble with 5ghz, lots of variability in packet RTT, and packet loss. At 2.4ghz it was better, but still not very reliable. It'd disconnect a lot, and the connection would just stop transferring packets until I did a disconnect/reconnect.
I threw the 6205N back into it after a few days of putting up with it. Maybe I'll give these 16.1.1.13 drivers a try.