Omnidirectional speakers for home theater?

I use my Shahinian Obelisks for HT, and it works alright, in fact easier than with conventional speakers, as omnis spread a wider soundfield, and allow more listeners to sit in a realistic soundfield, rather than in a tight sweetspot.

No slouch,
I use them as front speakers only, but have tried two pairs as front and rear speakers (Diapasons in the front, Obelisks as rear). With omnis - or at least with the Shahinians - you do not really need a center speaker. At least I never felt the need for it. The speakers are that mighty, and give you such a good sense of scale and the room involved that I never missed the center speaker. I had a friend who works as a professional setting up home cinema systems, and who had told me that it could never work without a center speaker. After listening, he changed his mind.