I'm not convinced that their ad-hoc curse interface is really faster than GUI. First you have commands like "issue view" that... open the browser to display the issue. Then you have commands like "pr create" that seem to ask for tile and then description. What if you want to amend the title while you type the description? Well I guess you can always "preview in browser" when you're done. Might as well just do it from the browser to begin with honestly.
"pr checkout" is the only command that seems truly useful and a time saver to me.