Bottom line, when it comes to ADSB traffic and you've only got an ADSB receiver, not an ADSB out transmitter...
...your mileage may vary, since ADSB traffic data is only transmitted from the ground stations when it's "woken up" by an ADSB out transmitter in the air.
For two years I flew with an original Skyradar ADSB receiver. I am based under the Houston Class B wedding cake and have to fly through the corridor between the two Class B airports in town when I head west--in other words, I'm surrounded by airliners and other big boys, many of whom you'd think would be waking up ADSB traffic transmitters for me to leech off of.
Except that it hardly ever happened. I almost _never_ had traffic info flying around Houston.
However, if I flew up to Dallas, boy howdy...my traffic display would be lit up like a Christmas tree. Targets to the left of me, targets to the right, targets in front, behind, above and below. Where'd all these guys come from??
Fly back home to Houston, and the display goes dark again.
About 3 months ago, I bought a SkyGuardTWX transceiver (i.e., in+out). Suddenly, when I fly around Houston, I see traffic all around me, just like I did in Dallas. I also routinely see traffic targets en route when I'm nowhere near Class C or B airspace, as well as in Class C areas where I didn't used to get much traffic data.
So: If you don't have ADSB-out, you might get some traffic hits, and you might not. It might be heavily dependent on exactly where you fly, and how liberal they are with broadcasting traffic data even if no one's "waking it up" with ADSB-out.
If you want to have a more consistent ADSB traffic picture, then upgrade from the one-way receiver to a two-way transceiver.