FWIW, I've used the high quality Quack and then the glorious Geiser for several years. During this same period, on occasion I'd give DR a trial only to quickly retreat. That is no longer the case as of several months ago. I've switched solely to DR and haven't mulled for a moment about reversing. If configured just so with the addition of a couple of custom key-bindings, it rocks. Of course one's IDE selection is very personal and YMMV.
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