The SR9 has been out for quite a while now, looks basically like a SR8 with the "SDR" capabilities of the R8, as mentioned. From what I've read, the SDR capabilities are rather rudimentary, interesting to play with, but not really much to write home about. Only really gives you a waterfall on Rx, and some limited DSP filtering. If you want to really get into SDR, get a FlexRadio or something.