The Alside Centurion windows are a REALLY old design. They use mechanically fastened corners on the frames and sashes rather than welded corners that have been the industry standard for years.
Alside custom manufactures a full range of replacement windows and the Centurion is the bottom of the line offering. In fact, it’s about to be discontinued as the new Alside Fusion will take it’s place.
Frankly, if you’re shopping for windows after 2002 and you’re considering the Alside Centurion you must be a price driven buyer. That’s ok as we know price is an important factor for just about everyone. Until the new Fusion comes out you might want to take a look at the Simonton 5050. It’s also a price focused product, but at least you’ll get welded corners!