My Caiman arrived on Saturday so I attached it to some headphones and to my amp and set it playing to start breaking in. Then the phone rang with a party invite so I put the music on repeat and went out.
Came back Sunday evening and thought I'd listen to a couple of tracks on the 'phones to see how it was sounding...
3 hours later

I had renewed respect for my venerable Beyer DT531 'phones. The Caiman drives them superbly. Even Pendulum didn't phase them. In fact Pendulum was something of a revelation. That bass kicks like a mule! So deep... so tight.
I played loads of stuff both old and new and I don't think I have ever had the hairs stand up on the back of my neck so many times in one session. I think I will be doing a lot more headphone listening from now on.
Transport duties were of course performed by the Transporter using a Mark Grant digital interconnect. I can't say yet whether I prefer the Caiman to the Transporter as the latter doesn't have a headphone output and nor does my amp.
I'll report on how it sounds through the Croft and the Zu's after it's run in for a few more days - and how it compares to the Transporter. Suffice it to say anyone who needs a digital-only headphone amp is likely to be very pleased with this one.
From what I've heard so far on 'phones at least it firmly wacks the butt of the Lavry DA10.