High Speed vs. Meltwater Blue: Singer 4423 vs. Features Revealed… Best Buys! We tested the SINGER Heavy Duty 4423 with its Meltwater Blue finish, and we were impressed by its smooth high-speed performance. The 1,100 RPM motor with enhanced piercing power makes fabric handling effortless, even with layers. Our favorite is the full metal frame, which ensures durability for years. The 97 stitch applications offer versatility, and the 1-step buttonhole is a time-saver. The LED light brightens our workspace, while the accessory kit comes in handy. We appreciate how user-friendly it is, without compromising on power. Whether for beginners or pros, this machine strikes a balance between performance and affordability. We recommend it for those seeking reliability with a stylish touch.