The only downside to the Kwonbars is the inability to adjust included angles and/or spacing as circumstances dictate. That said, I used Kwonbars with my Schoeps for a long time and loved 'em. But I now enjoy the flexibility of the Vark bar for modifying spacing and included angle.
After seeing Chris Church's reply to my MBHO and A53M thread, it got me thinking about shadowing/relfecting effects with the kwon bars, does anyone think it is an issue? The varks seem to have a lower profile in terms of showdowing/reflecting.
I'm new to this and have no experience whatsoever with actual results, but I see from cascade.com that the kwon bars are round and I seem to recall the rig picture Chris was referring to where he mentioned reflection...it seems that in the pic there was some kind of solid disc mounted behind the mics.
Anyhow, it seems that the round Kwon bars would diffuse sound away from the mics enough that there would be no reflection issues. If the bars were square or flat in the front, maybe there would be more of a concern. However, if worried enough about it, I suppose you could wrap some sponge, elastic, velcro, tape, or some such material around the bars to make them sound absorbant instead of sound reflective.
Thanks to everyone for the earlier responses to this post.
Steve