I work for h3-digital - a home cinema company here in Phuket, Thailand and recently was involved with a Klipsch / Marantz install featuring 3 pairs of these very large bookshelf speakers.
Its an expensive speaker, especially here in Thailand where it costs more than most floorstanding models, its also large, looking way larger in real life than reading the measurements on paper. The build quality is first class, I didn't like the grills much but our client didnt want to use grills in his home theatre anyway, so that wasnt a problem. They are much better looking speakers without the grills.
In terms of sound, WOW - these are loud and crystal sharp - Some may perhaps find the highs a little harsh for critical listening, but horn loaded tweeters can often be that way. The bass is some of the tightest I have ever heard, hooked up to a top of the line Marantz Receiver they outshone lesser speakers, including brand name 10" powered woofers used in previous installs.
If you have the space, and money for these I can only recommend them - Its the best sounding cinema setup we've done yet and a big proportion of that is due to how good these speakers are, They can be driven very EASILY, you dont need a massive amplifier to make these shine (altough of course it never does any harm).
Ben Hobbs
Home Cinema Installers in Phuket, Thailand