It has been working very well, although my AFS 3500 was only able to show traffic until about 4 month ago.
Rob at AFS keeps coming out with software release that enable more and more of the TIS-B and FIS-B protocol.
I also display traffic (TIS-A only) on my Garmin 496.
I think that this is the only way to go for traffic.
If you search the forums for navworx, you'll see a lot of more comments about it.
Kent