When I first started quilting (two years ago), I bought a cheap Singer because it was lightweight and could take it to classes. What has happened is the needle jumps out of alighment... had it repaired once. One week later, it messed up again! If I have it repaired again, I will have spent enough $$ to buy another one!! So, I'm learning to sew with the needle off center.
To answer your question, a 2nd machine is good backup if nothing else.