I've got the Ivory Chatsworth and have two heads, the Merkur and the new Jagger/Muhle version. The new head is my favourite, but there's not a lot in it.
They are nicely made and well balanced razors.
If you get one with the new head, a Merkur head from a 3 piece will fit too.
Pete
EDIT: when I say there's not a lot in it, I mean shaving wise. The plating finish on the the new heads is much better, something that has been letting Merkur down.