Generally I would recommend against running RC builds. I was willing to take the risk in this case for lemm.ee, because:

• I feel comfortable with debugging and fixing issues in code as they crop up
• I have been working myself on stabilizing 0.18.1 and am pretty well aware of its current state
• The set of problems in 0.18.1-rc4 is a bit better than the different set of problems we had with 0.17.4 😅

At the end of the day, you have to acknowledge the risks and see if they're worth it for you.