On my wish list of stuff to buy is the CMC6. I've used them a few times and have had good luck with them. However, I have a friend who is selling a set of CMC5 and I was curious if the difference between the two is worth holding out for the CMC6? I am actually only worried that the roll off frequency of the CMC5 is 30Hz whereas the CMC6 is "flat" to 20Hz.

Any advice?

I've just purchased a DPA UA0837 stereo boom - the one without the mic clips. Now, I didn't know this beforehand, but the sliders on the boom are designed to hold mic clips with a narrow thread (a la the DPA clips)... . The problem is that the sliders have a kind of groove that ensures that only clips with a very narrow base will fit there.