I have the same device version number as you (4V00.0810), and I have been using it OK for months. I was one of the lucky ones who got it from Tiger GPS for $59.95 as a result of pre-ordering it a year ago.
Coverage areas are limited, and do not know where you are located. You have to be able to get a fairly strong signal from the traffic radio stations for it to work. How you setup the receiver antenna is also important.
I also don't know what TT application version your have. I did find with 6.525, I would have to disable the bluetooth traffic service before the traffic receiver service would work. With 7.162, this has not been a problem.