I still think I need to get my hands on an RX series version. Let's get crazy, why not, how about an RX5? Ha.
Knowing you liked the Cure CX, you should give the RX a try. When I tested a bunch of putters a few months ago, I was sure I was going to be blown away by the RX. I could not make it work, and I attribute that to alignment woes. A center-shafted CX3 is intriguing to me. For me, it's some unknown combination of center shaft, face balanced, and alignment aid that makes a putter work for me. My current gamer lacks a center shaft but is face balanced and has a big alignment aid, and I really like it. My gold standard putter remains the SeeMore Giant M1t, which is center-shafted and face balanced, but lacks a long alignment aid, which I suppose speaks to the brilliance of their RST.