I bought my SkyRadar primarily to have subscription-free weather radar in the cockpit. For that, it works fine.
I have not seen a traffic alert on mine, but there is a known limitation that an aircraft in the area needs to be transmitting ADSB-out before the FAA will broadcast traffic information in that area...since the SkyRadar is only a receiver and not a transmitter, another plane in the area must have a transmitter to wake up the FAA's broadcast before the SkyRadar can receive it.
Others have reported issues with winds aloft, but I have not tried to use that in the cockpit and can't say whether it works in my area or not.
I am happy with my purchase.