My wife and I were just talking about Rangpur today, even sucked the juice out of 1 earlier.
I disagree about it being a terrible fruit, I enjoy Rangpur but I am also somebody that enjoys Kaffir Limes and eating lemons and limes out of hand...
Has a limey taste with a strong orange zest, very tart.
Great to add to fruit juices and for salad dressings.
I wouldn't plant an orchard of them but if you love citrus and novelties 1 tree is a must even if just potted.