In the 90s I used to record a lot in a studio that had one of the surviving Helios desk, which was maintained by Tony Arnold himself. And regarding this plugin, I have to say that it's pretty close to the real thing in its behavior and sound. But one thing I found is that this plugin version has a tendency to "over-react" to gain, which distorts a bit too easily compared to the real thing. Maybe that's because the desk I used in the 90s was a later model, which are known to be quieter. So I went with 4 stars on this one because you have the be a little cautious with gain matching, or else it can ruin your sound pretty quickly.