Singer 5532 and 4452 are heavy duty sewing machines alright. They look very similar in features. So the billion dollar question is, what is the real difference between them I will try to break it down for you. First of all, let me clarify one point. Some people have a misperception that only Singer 5532 comes with a clear cover for top drop-in bobbin. This is not true. Singer 4452 also comes with clear cover for bobbin. The main purpose of the clear cover is to monitor the bobbin thread supply easily and both 5532 and 4452 have this feature. Both Singer 5532 and 4452 come in the same color. Both come with 32 built-in stitches including 6 Basic Stitches, 7 Stretch Stitches, 18 Decorative Stitches and a one-step buttonhole. Both machines come with extra powerful motor capable of delivering 1. 100 stitchesmin. This motor is a beast, trust me. This is one of the fastest sewing motor in the entry level category. Other common features include automatic needle threader, top drop-in bobbin with clear cover, stainless steel bed plate, snap-on presser feet, heavy duty metal frame, on-board storage, free arm, extra high presser foot lifter, adjustable presser foot pressure, 6mm stitch width, 3 needle positions, automatic reverse etc. Feature wise, both 5532 and 4452 are identical. Then where is the difference It is in the accessories you get. Singer 4452 comes with bonus accessories which include Even Feed Walking Foot, Non-Stick Foot, Clearance Plate and Heavy Duty Needles Size 16. The bonus accessories are in addition to the included accessories like All-Purpose Foot, Zipper Foot, Buttonhole Foot, Button Sewing Foot, Seam Ripper Lint Brush, Quilting Guide, Needles, Bobbins (Class 15), Screwdriver, Auxiliary Spool Pin, Spool Pin Felt, Soft-Sided Dust Cover, User Manual, Foot Pedal etc. Included accessories are the same on both 5532 and 4452. Just that 4452 has some extra bonus package.