This was on hold, but has come available ...
Bobs Devices SUT - the exact version reviewed here.
Review says most of what you need to know. The high gain setting is perfect for Denon 103 and many other low output cartridges around 0.2-0.3mV. Low gain is ideal for cartridges with slightly higher output, from 0.4mV upwards I would say.
I got it silly cheap from Jake who was having a sell-off recently, but I don't really need it. .
It's worth more but I'll sell it for what I got it for which was £200, plus £10 for RMSD. Would swap for a valve phono stage, this would be my preference over a cash offer so I may leave it open a little while to see if a swap appears.