I would prob. like the guy in real life and have fun drinking beer and maybe BBQ'ing with but I dislike his clientele and the fact that he support the reckless abuse of rf power. His clients and business model is why the 2SC2879 is priced out of sight now. His lot burn through transistors like steam engine burns through coal!
I am sure his business model is FANTASTIC for him and keeps his family in good shape so I can not fault him there.
When I was in H.S. 2SC2879's were $12 a pop in college they were about $24 a pop towards the end of my first 5 years. As those dried up they moved on to other's driving the price of those up too. So I come pretty close to hating his lot but not him personally. I hold him and his lot in the same light as people that hunt animals to extinction or close to it forcing all kinds of restriction on people that just need to hunt to eat and live.
Hobbyist are driven out of the market by rednecks with more money than brains and reckless ignorant builders like Joker Electronics for instance! Sure you have seen his stuff looks like Christopher Reeves or Stephen Hawking assembled it with a plumbers soldering iron back when they used a bucket of hot coals and plumber solder.
On the merits of his designs I can not say since I have never owned one, used one or known anyone local to me that owns one or runs one. Having watched his video's his workmanship in the designs he builds seems to be sold. He strikes me as someone that put's forth his best work and has standards in his field.
I have never heard anyone that is not his competition say anything bad about him professionally which is saying a lot since "builder's" and the lot they pander too are about as katty/catty and back stabbing and scheming as your typical middle school/Jr. high school girl!!!!
If he has a problem it would be that he takes everything personally as an attack if it is not glowing of sun shine and daisy's and if you try to educate him or correct some belief he has with facts in anything even not electronic he acts like you just shoved a corn cob up his rear!
I would not be afraid to do business with them though not if you like the style of amp he builds! I am normally a good judge of character and I do not think he is in this to cheat anyone.