This product is extremely useful at this price point. Thr tektronix signal vue software is world class and makes interacting with the equipment easy to do. I haven't had the opportunity to measure some of its performance metrics, but it has worked extremely well for SDR troubleshooting.
It goes up to 3Ghz so it covers the low frequency range but it has lots of power. I also have two of the RSA 6114A versions, which are basically the same but go to 14 GHz. They have great analysis power and would recommend them. They are not state-of-the-art but that costs you $60K+.