Samuel:
I posted my experiences with the Prima Luna
here in Audiogon .
Based on my experiences with the Prima Luna Prologue Two, I traded in my Musical Fidelity A300 power amp in my main system for a Prima Luna Prologue Five.
To answer your questions ... yes, it is extremely well built. It is probably the most enjoyable and musical amp that I have ever owned (I am in this hobby for 35 + years). It is absolutely a no fuss, no bother amp.
To add ... the stock tubes will serve you very well ... if you upgrade tubes, you will be treated to additional refinement. The Prologue Two works well with a variety of speakers. I have paired it with Acoustic Research 302 (classic series from 1995; acoustic suspension design; 10" woofers), as well as NHT SB2 monitors and currently Omega Super 3, high efficiency single driver speakers. Sounds great out of the box.
As you can tell I am a big fan. I have found no faults with either the Prologue Two or Five.
Regards, Rich