crane rocker arm conversion

http://www.ebay.com/itm/Crane-Rocke...ash=item5d60650378:g:JI4AAOSwK7FWho02&vxp=mtr

has anyone on here use this conversion to get away from the shaft mounted rockers they kit says you can then use normal roller rocker like chevy and some ford application any info on this and if it worth it or not