My 0,02 eurocents,
I've owned DC 13.4 with ANR, loved the ANR, hated them after every hour of flying, also interference with intrecoms, real skull crushers. Got rid of them
for a Sennheisser HMEC 300. What a relief !
Then bought my SR20. Got a Bose X with it (with the Lemo / redel plug, standard on Cirrus, so no battery needed).
They
are worth every $ IMHO Needed some more headsets for my family so I als bought a Sennheiser HMEC 100. Its the same as a 300 but no ANR, still good passive performance.
And a HMEC 25KAs for my wife. I also used it for my twin training. Its a hidden treasure in headsets. At the same time I trained a friend of mine bought a Bose-X in the States. He is in a club of 6, owning 2 SR20's and they all but one (BoseX) use Lightspeeds 25XL's.
They are good while flying, but they have a serious quality issue. All of them broke at some time. That is why he also went for a Bose. If you want a decent Lightspeed, PM me and he might make you a great deal on it.
S.