Nigel, yes I am still using the Chiarra as the main amp in my second system (though soon to be replaced with a Meier Prehead).
However, I have recently done a bit of an amp shootout with my Chiarra, Corda HA-1 Mk I, Headroom MOH (old version) as well as the Headline/Hicap (although the latter was only an unofficial entry, since it cannot be easily compared to the other amps, due to Naim connection difficulties). The result, to my surprise, was that the Headroom MOH came out on top, with the Corda HA-1 only slightly behind, and then the Chiarra a notch below that. I had been expecting the Chiarra to be the clear winner, especially after replacing the op amps with BB2604 and defeating the balance control. I was also surprised that the inexpensive Corda, which even Jan admits was not designed with ultimate sound quality in mind, sounded so good against the other amps, and almost as good as the much more expensive Headroom amp. I should add that all these amps are excellent, and I could happily live with any of them, and the Chiarra remains a favourite even though it did not appear to be a clear winner in this experiment. I will have to repeat the test some time to see if the results differ.