Service and price were fine, but the Sensen struts...

Service and price were fine, but the Sensen struts I bought were of very poor quality and all failed, one immediately, which they replaced and eventually the others as well. These were really bad struts. Two days ago my car sounded like the trunk was full of bolts and rocks. Yesterday I replaced rear struts on my 98 Lexus ES 300 with Monroe's and car is quiet. Next week the front gets replaced. They should not be selling such an inferior part. I'm sure I'm not the only one who had this experience with Sensen.