I built one a few months ago... for $100, it works like a champ! You may not be able to get data until you're ~500AGL and in range of an ADS-B ground antenna, but then you will be able to pick up weather and NEXRAD overlays. Traffic is dependent on someone close by being ADS-B in/out as the Stratux (and any other portable receiver, the way I read it) is "leeching" the traffic data from someone else who has a properly formatted message that tells the ground station to broadcast it out.

I use it with ForeFlight. Seamless integration.