I essentially bought the XC60 for this feature, and after a couple of days of driving, the driver's side Blind Spot light stopped working properly. It mostly just blinks steadily, sometimes just stays on. I took it back to the dealer and they upgraded the software. That seemed to make the problem worse. The passenger side works fine. I washed the sensor area as the owner manual suggests. It's back in the shop now for the second time in three days. Frankly, the driver side window rear visibility is not great in the 2010 XC60, so BLIS is a very handy feature to have. I'm curious if others have had problems, and if you have any potential solutions I can suggest to the dealer. Thanks in advance for any help you can provide.