any one using PRW rockers?

i've seen the PRW rockers & was wondering if any of you have used them? i'm looking at a set of 1.5 rockers for big block mopar. i've never seen them first hand to form an opinion of them, just hopping you guys have. not sure weather or not to go with the aluminum or stainless rockers. it's for a 451 with either a hydraulic or solid flat tappet cam. i haven't made up my mind yet. lift should be around .550 & duration @.050 around 250, so the spring pressure won't be crazy high or anything. thanks