What's the verdict on these? Have many used them with great success? I tried searching but the trheads were older and didn't give a definitive answer. I have a set I got with my rebuild kit from them.Went with them as they had the best rotor housing prices when included with the kit at the time. I still have to do a Mazdatrix order and could get some stock ones but don't want to waste the money if these work as advertised. Thanks.