What will I _do_ with it? Excellent question. Well, the first thing I went looking for... is to see if I could use it to JTAG single step debug my ESP32. (I usually use the Tigard). 

But as the JTAG is likely implemented in the FPGA (right?), I likely will need a bit of instruction for that. I've been using the VisualGDB extension for Visual Studio & the OpenOCD. 

Beyond that, I want to improve my reverse engineering skills. So I need to start reading up on the Glasgow docs to see just what it is capable of. Yes, I've waited a long time for delivery. No, I was not smart enough to use that time to read up on the capabilities! lol 
https://glasgow-embedded.org/latest/index.html