While doing my ppl in Florida a couple of years ago, I bought two pairs of Lightspeed 20K's. The difference from the school units was amazing.
The second unit that I had bought for my wife to use was rarely out of a plane, because the instructors all wanted to fly with it. Several of them were thinking of getting a set instead of the David Clarkes that they were all using.
The headset is really comfortable, even when worn for several hours a day. A good trick is to wait until you're flying, and then turn on the ENC. It seems to suck all the noise out of your head.
Because I bought mine while in the states, They just came back in my flight bag, hence no tax or duty. If you know anyone going to the US to do some flying, this might be a good way to get a pair at a reduced price.
Hope this helps,
J.
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"Every time I learn some new stuff, it pushes some of the old stuff out!" - Homer Simpson Esq.