As far as I know, Scantech (which I believe is now called Professional Parts Sweden) makes little or nothing; they source parts and market them. Some of their parts seem fine. For instance, I have been using Scantech heavy duty springs for many years and have no complaints.

The overwhelming majority of Scantech parts, however, have been junk. The plastic and rubber parts are especially bad, and many people have done a difficult job like changing bushings only to have to do it again in weeks or months.