I have it and I love it. Been using it for almost a year now, and will continue to use it in the future.
Works great, and sure it's delayed by a few minutes, but I've found it to be only a delay of < 5 mins most of the time.
Never used flight aware, but I just did a bit of looking and from what I can tell it's only an online application. One of the things I love most about Air Nav is that I can move around the map, zoom in and out, etc. relatively quickly so I can keep up with what I'm hearing on the radio feeds I listen too. (Plus flight aware doesn't seem to work too well with Canadian Traffic, which is a big problem for me!)