I originally bought the horizontal center because I had things arranged differently in my room (i.e., my system used to be where the couch is now) and the center was actually below the TV. For some reason I always thought a vertical center would be too tall and I would have to be looking up at the TV. And quite honestly, before I had my Meridian system, the idea of vertical center was somewhat foreign to me. So I purchased what I have always thought was right and that is the center channel should be horizontal. I really didn't get educated until I joined this forum. Believe me, I look it every day and think, "man I wish I had a vertical center channel speaker."
That said, the sound is way better now than when I had it below the TV. With the exception of DVD-A/SACD, I listen to all my music in Stereo or Direct mode and the imaging is phenomenal.
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ultima_gtr, I searched for months for the IWC clock. I couldn't find it in any dealer shops and I finally found it on eBay. Next to Meridian, it is my favorite piece in the room. Watches are another hobby of mine. I have an IWC Flieger Chronograph. The Ingenieur collection is very nice.