A one user opinion. YMMV The bottom line, before I get to the bottom, is: Buy the best you can afford. That said, the application is also a factor. Why over spend? I have, what turned out to be an eBay clone of the RSP1, the MSI.SDR. I had an RSP1A. I have an AirSpy HF+ Dual Port. Canada Post is 'sitting on' my AirSpy HF+ Discovery. I have a bunch of RTL-SDR sticks, both no names and RTL-SDR Blog and NooElec versions. I had 2 or 3 different SoftRocks as well. Within the assumed price range, my choices are: From a value point of view, I think the RSP1A is the best one. From a performance point of view, I think the AirSpy HF+ is the best one. If money is not an issue, check the ELAD FDM-S3.