The .main reason for not giving it 5 stars was the purchase process.
After much evaluation we plumped for the 4432 heavy duty, evaluation done, no, they sent a 6335m Denim,without explanation. We could have purchased this model £30 cheaper elsewhere and it isn't what we ordered! Reevaluation! After much investigation, we decided to accept this model, but with a £30 discount. Although used to industrial machines, so far this has performed.
If I order any product, I don't expect a different model...

Singer Heavy Duty 4432 Sewing Machine - top spec, 60% stronger and over 30% faster, 32 stitch patterns, overlocking and stretch stitch