I like the Heil Pro Set Plus my friend has, but my Heil Pro Set from
Elecraft are almost unusable after an hour or so. The size of the hole
where your ear fits is quite different, and the headphones I bought from
Elecraft make my ears hurt a lot. It's enough that I'm about to buy the
Plus.
I had the same experience, but then just reduced the tension by
bending them open (ultimately, slightly "backwards") until I got the
tension down. Now they do pretty well. My only criticism so far is with
the active noise cancellation b/c the cutoff freq is just too low. It may
work great in an airplane or next to a freeway, but it does nothing to
keep the sounds of other operators out.
When operating cw, I use a pair of medium range phones from Radio
Shack. I just went down and tried a bunch, found the pair I liked the
best, and replaced the plug.
The phase reversal trick on the Heil is pretty neat! No problem
adding it to most headphones. One can also achieve the same effect with a
center-tapped isolation transformer at the input. It should also be
possible to do it with just capacitors, but I haven't done this yet b/c I
want to try tailoring the values to get some kind of useful effect from
the freq. dependent phase shift :).
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