I'm doing it right now, lol. I have no issues with it! I've discovered that having someone else who I know I will have to send something to actually ensures that I'll stick to a somewhat consistent writing schedule. I don't have any shame when it comes to the plot or whatever because it is a first draft, and there's going to be issues. I have an editing system for each chapter and I make it as clean as I can before sending it, because that's what works for me. Plus by critting my writing buddy's work, I'm getting valuable experience that I can apply to my own as well! Win-win situation