My client and I both got a Joulescope independently of each other – and we both found it to be quite useful for seeing wide-swinging power demands. He uses it to monitor power demands of a cellular modem that he is bundling into his product – so he is particularly interested in the uA range performance of his product while being able to see the A range draw when the modem kicks in.
I like it because it’s an easy setup for an isolated current measurement into my PC.