Yes the unit certainly has limitations, though for the price is not to bad really.
Here's a -4dBm carrier from an ADF4351 at 50MHz.
The TinySA shows a wide flat top and noise floor of only 45dB down at 12kHz away from center, where as in actual fact the carrier's noise floor is 80dB down by the time your only 1kHz away from center.
A useful unit all the same.
