Dennis616
I don't think it is that rare of a feature, but if that characteristic is something that interests you and that you might incorporate into your hybridizing program I would say you might want to keep it. I am not yet to the point where I am faced with those decisions so easy for me to say either way. But when the time comes I will be looking for sculpted relief, but I want a lot more than the one attribute to be the determining factor. I am sure you do also, so what else makes you like this plant enough to want to keep it? If it has a few of the other features you are looking for then of course that makes it more likely to be a keeper.