I built the device to get a better view of my embedded designs than my trusted logic analyzer/jtag setup. I routinely use multiple processors and FPGAs and can't use breakpoints due to it killing my system.
I basically took the best of trace (aka printf/print/caveman) debugging (fast, easy, direct, familiar), minimized the pitfalls (slow and obtrusive) and sync it to logic, analog and decoded bus signals. The tool gives a really clear picture of what is going on in real-time in all parts of my system.
The software app runs in demo mode for those that want to try it at https://www.activefirmwaretools.com/download
I personally designed all of the hardware, firmware, RTL, software apps and web site and I'm happy to answer any questions and welcome feedback.