Is it much worse, quality or sound wise, than a weber mass or ultimate attenuator, or something like that?
It's more expensive than any of the many Weber units by $100 or more (except the MASS III, which is a totally different monster but still $50 cheaper), it's twice as much as the Brakelite, and it's the same price as an Airbrake. So really, where are you getting your information? It's smack in the middle of the range for attenuators, maybe even creeping towards the high end now that more companies are making stripped down versions.

It's similar to the MASS, they've each got a few features the other does not. Same with the Airbrake. Haven't tried an Ultimate, but considering the price I imagine there's a difference.

Edit: I'll close this, since you decided to make more threads on the same topic.