I, too, have bought an amp from elnero -- in my case, a humble JMT-built Cmoy with Meier cross-feed. In terms of parts, features and design, it's the best Cmoy I've ever used.
But back to El Nero.
I found our Spanish Stradivarius-twanging col-legnoist to be more than polite, prompt, soberly honest and tear-provokingly patient -- he was also Canadian.
Kudos to him and his amp, which arrived in perfect shape and precisely as advertised. I would hesitate to do business again at the moment -- but that's only because I'm out of money. Otherwise, Nero's on my Paypal account's speed-spend. In a word, the gent is aces.