I use my mom's old Brother from the late 80s. Very smooth and quiet; works wonderfully. I've recently acquired a Kenmore serger and still trying to figure out how to use it ^_^
I also often use my friend's Singer since we always go to her place to do the finer details. She got it 3-4 years ago, and it needs constant maintenance unlike my mom's old Brother. Her Singer is louder and the threads tangle easily. Maybe I need to play with the tension a bit more...