Have you used a paid on-demand expert help service to screen share/pair program/review code with someone? (e.g. CodeMentor)

Hey All! As the PM for Visual Studio Live Share, I care a lot about making team-based collaboration amongst teams more enjoyable That said, in some cases, you may be working solo on a side-project, or your team might not have the answer to a question you have, and therefore, it may be worth using an on-demand expert help service to get quickly unblocked (e.g. CodeMentor, Pullrequest.com).

Have you ever used (or considered using) a service like this? Im curious to hear if folks have ever paid to get help, have a peer code review, do some pair programming, etc. and if so, what service you used. Id also be interested to hear the scope of the task (e.g. quick question vs. 2 hour pairing session), the programming language your used, and overall, how your experience was. Thanks!