The AR-Alpha is not designed for the hobby market, it is designed for the professional market and is a FFT receiver with amazing scan speed (up to 100MHz/sec) without sensitivity loss.
Also the bandscope covers up to 1 GHz and is nothing like the slow SDU5600. P25 is included, it is an option for the Icom, The Icom is not a FFT receiver.
Gommert
www.butelsoftware.com