Charles
Blends with robusta and their higher caffeine content give me the shakes and that is simply unsatisfactory for my putting stroke and my golf game

Also, I am not one who has noticed that it adds a positive flavor to any blend I've tried. The body and crema do not make up for the taste IMHO. Your tastes here are what matters so go for it and let us know.
Comfort espresso is a big positive for me. It is predictable and leaves a lasting satisfactory taste in my mouth that reminds me I want more later on. As example, I tried a Yemen Mokha Sharasi as a SO earlier this week and I was not happy at all. I think I wet bit too far with the roast and it didn't get enough time between 1C and 2C. Having this comfort blend around saved my week. I am currently playing around with beans and ratios in my blends as well as tasting them as SO's to get a feel for what I will ultimatley like as a go to home blend. The Moreninha Formosa has been my base in all of these for reasons given above.