I performed a search, but couldn't discern a definitive answer. Perhaps recent activity has made things clearer, but at present, here's the deal, judging from posts:
It's louder with the midpipe.
It's quieter with the midpipe.
It's quicker with the midpipe.
You lose some low end with the midpipe.
I suppose the most definitive answer is "Try it for yourself, dummy," but I was hoping not to have to buy one to figure it out.
Anyone?
Kevin