As an owner of Def. Pro's, I completely disagree with the classical music "limitation".
Between two such different speakers, I certainly would make any and all efforts, including traveling, to hear both before buying. Give the Def's some time, as some people find their ears don't "get it" immediately. Some people don't get them ever. But, if you ending up liking them you probably will love them.
I've used mine with tiny digital amps and SET tubes, both to great effect.
I'm not going to get into a long discussion here, it's all been said before. Search the archives for previous discussion. I don't know how much is left but I'm sure it's plenty to get both sides of the discussion.