From what I own and what I have heard, the horn speakers are not really colored. I would say that they're less exaggerated and give listener more control over how they want to listen via both active and passive crossovers.
Due to the larger and more open sound, the lower frequency is not as well define due to the open enclosure. That's why some folks prefer to match horn speakers with subwoofers with seperate amplication. However, the listening experience is very different from the conventional cone speakers. Once you heard, it is hard to live with conventional speakers. If there is no size and space restriction then I would go with horn speakers for more versatility ( especially for large orchestra, opera type of music )
Just my 2 cents