Summary: The KOSS SB-45 is a real bargain. The SB-45 sounds good and is comfortable to wear over extended operating periods. Microphone audio is good enough. While dropping or tossing this headset around the shack is contraindicated, this headset is well made and durable. What do you expect from a $40 headset? The electret condenser type microphone capsule is rather "hot" and presents a strong signal to the rig.
Summary: Purchased these to replace a popular gaming brand name set. The first set broke and was replaced via warranty, second set broke within months, warranty no good for 2nd set. Got these Koss because lifetime warranty, they seem better built and actually sound way better, mic works way better too. All this and half the cost of original set. Its the way to go, I've always been a fan of Koss.
Summary: The headset is comfortable, it doesn't feel heavy, and the cups don't press against my ears. The cups are adjustable up and down, and the microphone boom swivels up out of the way. I wish it would go another notch lower, but it seems to be all right in the lowest position. The headphones fold up flat so they're easier to stow in a suitcase or drawer. I didn't have a bit of trouble using this headset.
Summary: I've only had this set for about a week, but the field testing has turned out quite satisfactory. Mind you, this is a very inexpensive headset combo, but it works very well and feels very comfortable. I have worked several hams and their comments to a man were "don't change anything". Good crisp full range audio in the mic, and the phones reproduce the incoming audio as well as any I have previously used.
Summary: Big difference between these headphones and the Heil traveler dual. I'm using the Koss headset for the 10m contest, using the Kenwood 480 with CW filters and with the Heil I had the sound between 12 and 1, switched to the Koss and dropped it down to 9 and I was able to hear stations that I couldn't with the Heil. On voice I get reports of a hum on my audio with the Heil but when I switch to the stock hand mic it goes away.
Summary: I use this headset for performing remote sales demos and remote technical support. The clarity is great and audio for the clients are also very clear and crisp. The unit was plug and play set up. I am very pleased with the product which was much less expensive than other units I compared.