Some companies don’t need to advertise as much as others. In Rowland’s case, word of mouth has clearly been enough for them for years. As is mentioned above, the amps are an excellent choice for someone looking for a semi bullet-proof ss amp that sounds great.
Now, I am a little biased, as I own and have enjoyed for many years a model 8. After those many years, Jeff updated and modded my amp, and for what I felt was a very reasonable price Today this amp can stand with any ss amp out there. How many ss amps can you say that about, that are over 20 years old?
Some may not like Jeff’s reliance now on Class D, but there a still plenty of folks who do see the value and appreciate the SQ of his designs...luckily.