Best machine I ever had was a Singer that I bought used for $25 in about 1963, one of those old fashioned looking black ones. Lasted over 30 years, and I made most of my own clothes and curtains. Like anything else, they don't build them like they used to. But then, it did not even have zigzag, and the buttonholer was an attachment.
I have a Kenmore I have owned for about 10 years that has not given me any problems. Has a needle threader, which has become a necessity.