In the mid 80's I wore out (that's what the repairman said) my Singer, and bought a 630 (same series as 150 and 610)
I told him I wanted something without a computer, and have heard over the years from various people that it's a work horse.
I have always loved it, and still do. A few years ago I got to thinking that I bet some of the parts inside aren't made anymore, so I now have a 610, a 150E, and 6 630's, all purchased cheap because they don't thave the new buttons and whistles, nor a computer. I learned that this was the machine that many schools had, back when schools had machines.
I have NEVER had a problem with stitches, it even FMQ effortlessly. My feet, and other things fit all 3. Sure, they are expensive, but these machines are solid. I heard a couple of years ago the company was sold to someone, which makes me think maybe the quality is going to go down (like the Kitchenaid mixers did) I paid $830 way back when for a new one, and that was a lot for it back then.
My daughter has been instructed that if her machine ever breaks, one of therse will do nicely (unless she wants a new one, but she doesn't sew that much)
I just remembered, I have the 150E which is part of the series. They did make a 150 (without the E) and it is not part of that series. Let's see if I can remember the story I was told - Viking made the 150, but by the time the raving review of it came out(Consumer Reports?), they had already started making the 600 series, but since the review was overwhelmingly great, they just called the beginning o0f the 600 series the 150E, that way taking advantage of the 150 reviews, but really a new series with newer doodads.
I would check - if it's a 150, I'd pass, but if it's 150E, I think it would be great for a beginner.