Oh I absolutely believe it. One of my blends is a 50 / 50 of Robusta and the General Utility bean I sell. The GU gives just enough of a bit of a Chocolate flavor to take the burnt rubber out of the Robusta and it wires the shit out of you when you drink it because of all the Robusta. Most of them LOVE it. I try to educate people and offer them the better coffees but they grew up on Big Blue and Red and that Chickory stuff and love it. If ... puke.... THIS is what you want,ok Ill sell it to you but this is NOT good coffee. I even tell a group I sell to, this stuff is shit you know, oh but we love it. Ok...
In small amounts the Robusta will impart different flavors that are not all that bad, and I can't believe I am saying this, but my Robusta is a better grade, if there is such a thing. Looking back, it's almost embarrassing to say that, I ordered a bag from Royal once and they switched out with some other Robusta and I got a bit upset with them, to the point that the bag went back, explaining that NO ...Robusta is NOT Robusta, my customers will TASTE this and not like it!!! It's like trying to put a grade on sewage but well... It does have it's uses.
I only sell HIGH GRADE A1 garbage
Aaron