"Bright" (citrus without being acidic?) smell and flavor with a cherry note (largely aromatic,) and nothing surprising in the finish (which I consider a good thing,) which has a certain richness that is perfect for any preparation method.
Though I say I'm familiar with Sumatra beans I really haven't roasted or had them since I started drinking coffee with an espresso machine, about 17 years ago; and it wasn't because I haven't liked such coffee, rather I was always trying different beans, and when I was done roasting, it is fairly close to how I remember (Sumatra coffee has a certain aroma and character that seems unique for some reason.) The flavor is similar to what I recall of Jamaican 'Blue Mountain' though with a brighter tone, and maybe it's just because it's an island coffee which has more volcanic soil?
Since I tend to make espresso, the crema is fairly nice and it's not too overpowering nor too bitter, so it might be one of the more ideal beans for espresso, and since it has a sweet profile it could blend very well with anything you could mix it with; and the more I consider it, an iced coffee variant wouldn't be bad to experiment with.
This roasted consistent using a stovetop method with a little over a pound in a batch within 25 minutes using intermediate heat for consistency. I stopped shy of a full city roast after the "second crack," and in that state the beans are not oily. They have very little chaff and are some of the cleanest beans I've come across.
5 lbs. Sumatra Mandheling GR1 DP Natural 100% Arabica Fresh Green, Raw Coffee Beans
I have not yet run out of my previous order.