In terms of Responsive Site Designer from Coffee Cup… I purchased their Responsive Email Designer app last year with very high hopes for it. I did not like their builder interface at all. I find it very confusing to use. When I saw that they released RSD, it seemed to have the same interface as the Email designer had. Hopefully with time, they will improve it. I do think that with some UX tweaks it could be 100x better.
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