We are on our second set of Eartec headsets. Our first were the wired models -- wires ran from
the pc headsets to wireless receivers that you had to wear on a belt or attach to you somehow. They worked reasonably well, but the wires were a bit of a pain. We now have the UL2S, which are fully wireless. A big improvement. They have proven more reliable (syncing up, etc) as well. I agree with the others -- they are great to have, and a worthy investment!
The Eartecs are kind of big and bulky, though. At the Seattle boat show, I saw bluetooth wireless headsets made by Sena on display. I had heard about them recently from a fellow local boater who got a pair for Christmas. He opted for them over the Eartecs. The Senas are smaller and lighter, which is appealing. I don't have any experience with them, though, and the Amazon reviews look less positive. Still, if I were purchasing anew today, before getting the Eartecs, I would want to check out the Senas as well because of the more compact size. The cost, off-hand, looks pretty comparable. Here's a link:
https://www.amazon.com/Sena-SPH10-10-Outdoor-Bluetooth-Intercom/dp/B0087NB2OU