I'd rather run "good" iron rockers than "cheap" rollers. I prefer the Isky's with the hardened tip inserts but I guess the Crane's are ok too.

Apart from poor construction (materials), just about every roller rocker on the market lacks the ability to spray oil on either the pushrod, springs or both. Even my top dollar Harland Sharp's only oil the pushrod.

The iron Isky's and the Crane's (both appear to have come out of the same mold) oil both the pushrod and the spring.