Anyone use Magnaflow mufflers? What do you think?

they are both straight through style mufflers. nit chambered. the preforated core looks exactly the same. but i think the ultraflo uses fiberglass magnaflow uses stainless steel wool. i forget. i have used almost every brand muffler out there on my cars. i learned to hate chambered muffler. make more power with straight through mufflers and less drone.