I just replaced my older, cheaper sewing machine with the Singer Heavy Duty 44S.
I had been looking at the 4452 but the one I got was all they had on hand at the walmart.
The only difference I see is that the 4452 comes with a walking foot but the 44S does not.
I’m not sure if it will accept a waling foot, or if I need one, but I remember it being suggested reading about sewing machines here or on Hammock Forums.
From what I gather it helps with slippery materials.
