I thought the Telex Stratus 50Ds were very, very good - but quite bulky (not heavy - just bulky) and not as sexy as the Zulus!
Somehow (a bloodless coup?), I got relegated to the back seat of the Bo for the return trip from Kingaroy. The noise level from there, with the 50Ds on, was exec jet like - just a low hum!
Dr 