The 44 Magnum came out about two months ago, if that. The ZR40 was early '06. I'd like to see another ball with the CM core, but I'm not sure where to put it in the lineup. There aren't any high-end solid reactives except the TL which is quite old (I love mine), but with the solid/pearl mixes they've got, there doesn't seem to be much missing, reaction-wise.
SH