I have to say that checking the tension on your machine is quite important. My tension on my machine went out of whack and I had to keep checking it. I have a new singer sm and I love mine. It took a little while to get used to it because the reverse button on isn't where it's supposed to be. LOL. the needle threader works a little different than the brother. Perhaps a little more use and a little oil could help it some.
Happy sewing and Happy Halloween everybody.