I personally like the ACT 2 a lot although I haven't heard an ART I or II. Plus, ACT 2 only has four tubes to maintain vs. 10 on the ART series. There are quite a few ACT 2 used at good price in Audiogon.
C-J confusion.
What is the current SOTA C-J preamp? Is it the ART III or the Act 2 Mk2?