I don't know anything about sewing machines, Ramblinrev and others know best but, I have that exact machine you listed in your first post (without the table attachment thing) my better half got it for free (someone donated it to her) and it works great for us. We have had some tension issues, but got them worked out with some time and tinkering.
Formerly known as "Cranky Bear"....
"yesterday is history, tomorrow is a mystery, but today is a gift---thats why its called a present" - Master Oogway
It's always best if your an early riser!
I like hiking as it's like exercise!