Sophia Electric 91-01 and 91-5 300B

Hi,
I have been using a Tannoy Turnberry SE speakers for the last 1 year, I was driving it with Naim amplification and was happy with it. However I would like to add a good tube amp to drive the Tannoys. I have been listening to various amps. It is quite evident that SET based on directly heated triodes have a special magic about their presentation. However most DHT SETs are low powered, within 10 watts. Recently I read some very good things about Sophia Electric 300B amps, especially driving Tannoys. Jeff Day has given glowing review to it even replacing is reliable Leben 660P. But before I pull the trigger I am looking for some first hand comments from the community here which is expectedly more devoid of the reviewer's bias. Has anyone heard it ?

Moreover I am also looking for some views on the various models that Sophia offers, 91-01, 91-05 etc. Is it really worth going for their more expensive models like the 91-05 when the 91-01 already seems to be doing so well ? Has anyone heard the higher models ?