I purchased Sweet Maria's Rwanda Gikongoro Robusta in order to provide a more caffeine for certain customers who are looking for the extra lift.
From Sweet Maria's:
Rwanda Gikongoro Robusta- The cup is all about bittering cocoa, mild malty sweetness, muted acidity, and massive body. Roasted buckwheat, leather, and nutty notes mark the aroma and finish. Good for espresso blending.
I have only roasted one batch. I used a very small charge of beans, 200 grams, and really didn't know what I was doing as it was my first try with a Robusta.
I have never brewed this just by itself. I found it a very nice addition to roasts that needed some extra dimension. i have been using 10% to 20% added to coffees that aren't thrilling me. For a single V60 cup, I just add less coffee beans in V60 scoop,
,and top it off with the Robusta. I'm pleasantly surprised each time.