Here are just a couple of the many quilts I make on one of my 4, 301's. I used to own 6, 301's but have parted with a couple. I use both of the types of slant 301, free motion feet for the free motion quilting.
I do most of my charity quilts on my vintage machines and have about 30 that I rotate. But, I use the 301's almost exclusively for the FMQing. Most of my charity quilts are scrap quilts and these are made out of flannel scraps.
Oddly, two of my 301's prefer one type of FMQing foot over the other and I have no idea why. I finished up these two last week and haven't dealt with stray threads yet... but as you can see they're a great choice for FMQing.
I have a vintage 301 card table that the machine sets in and it makes it very easy to quilt.