The Flex 1500 is a QRP (5 Watt) version of some of Flex Radio's bigger offerings. There isn't too much in the way of hardware as the bulk of the heavy lifting is done by a high powered digital signal processor ("DSP") and a largely open source piece of software called PowerSDR.
Above is a shot of PowerSDR along with my CW keyboard program. Other than powering it on and off, everything about the radio is controlled through the software. Modulation, demodulation, filtering, band changes are all done in software.
That's it for now. I haven't had a lot of time to learn and play yet but I'm pretty sure it's gonna be a lot of fun!