I've had the Harley Benton PA100 for a few years now. The sound is really okay for home use, but nothing about the design is great.
When I saw this Rockboard attenuator, I hoped it could replace the Harley Benton. It looks better and sturdier and everything about the design looks better. And I was sure it would sound at least as good as the Harley Benton.
Sad to say it doesn't. It is really muffled and lifeless, where the Harley Benton just sounds more open, articulate and lively. Simply a matter of more highs.
Rockboard claims that with the attenuator wide open, there should be no attenuation. That is not true. Just like the Harley Benton it nocks off -9dB as soon as you plug it in.
I returned it, because at the end of the day I care more about the sound than how well I can read the prints on the device, where the in and outputs sit and how decent it looks. But it would've been great if Rockboard would've gotten both right!
Haven't tested the other options it has over the Harley Benton, like the line out with cabsim, the headphone output and aux input. Great that it has those options, but I'm pretty sure that won't sound better than my Two Notes CAB-M+.
TL/DR: If you want a better looking unit, get this one, for better sound get the Harley Benton PA100.