Yes, they do seem to be well built. You cant post stuff like that on AudioKarma. You will get a beating for buying Chinese amps, but at the same time they talk highly of amps like Primeluna, Line Magnetic, which are Chinese amps as well. I currently own the Willsenton R300 and i love it. I barrowed a friends Cary Insperation and rolled many different tubes thru it including 6L6 kt88, kt120, kt150 and a few others all while ABABABA ing the r300 to the Cary. The Willsenton 300B amp was better to my ear until i got to the kt150 tube. The Cary with the kt150 was the clear winner, but the Willsenton beat out all the other tubes that were run thru the Cary. I do use GL 300B and nos pre and rec tubes in the Willsenton. I have performed some mods on this amp including MuDorf caps and Hasimoto output transformers. The output transformers made no difference to my ear. Willsentons are mostly point to point.